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Parts of a Castle - Glossary of Terms
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Term Definition
AbacusFlat portion on top of a capital.
 
AisleSpace between arcade and outer wall.
 
AllureWalkway along the top of a wall.
 
AmbulatoryAisle round an apse.
 
ApseRounded and usually of a chancel or chapel.
 
ArcadeRow of arches, free-standing and supported on piers or columns; a blind arcade is a "dummy".
 
ArchCan be round-headed, pointed, two-centered, or drop; ogee - pointed with double curved sides, upper arcs lower concave; lancet - pointed formed on an acute-angle triangle; depressed - flattened or elliptical; corbelled - triangular, peaked, each stone set a little further in until they meet, with a large capstone.
 
Arrow LoopA narrow vertical slit cut into a wall through which arrows could be fired from inside.
 
AshlarSquared blocks of smooth stone neatly trimmed to shape.
 
AumbryRecess to hold sacred vessels; typically in a chapel.
 
BaileyThe ward or courtyard inside the castle walls, includes exercise area, parade ground, emergency corral.
 
BalusterA small column.
 
BalustradeA railing, as along a path or stairway.
 
Bar holeHorizontal hole for timber bar used as a door-bolt.
 
BarbicanThe gateway or outworks defending the drawbridge.
 
Barrel vaultCylindrical roof.
 
BartizanAn overhanging battlemented corner turret, corbelled out; sometimes as grandiose as an overhanging gallery; common in Scotland and France.
 
BastionA small tower at the end of a curtain wall or in the middle of the outside wall; solid masonry projection; structural rather than inhabitable.
 
BatterA sloping part of a curtain wall. The sharp angle at the base of all walls and towers along their exterior surface; talus.
 
BattlementParapet with indentations or embrasures, with raised portions (merlons) between; crenelations; a narrow wall built along the outer edge of the wall walk for protection against attack.
 
BayInternal division of building marked by roof principals or vaulting piers.
 
BelvedereA raised turret or pavillion.
 
BermFlat space between the base of the curtain wall and the inner edge of the moat; level area separating ditch from bank.
 
BivalateA hillfort defended by two concentric ditches.
 
BlockhouseSmall square fortification, usually of timber bond overlapping arrangement of bricks in courses (flemish, dutch, french, etc.).
 
BonnetFreestanding fortification; priest's cap.
 
BossCentral stone of arch or vault; key stone.
 
BratticeTimber tower or projecting wooden gallery; hoarding.
 
BreastworkHeavy parapet slung between two gate towers; defense work over the portcullis.
 
BressumerBeam to support a projection.
 
BrochDrystone freestanding tower with interior court, no external windows (which face into the court), spiral stair inside wall, typically iron age Celtic refuge in Scotland.
 
BurgGerman stronghold.
 
BurhSaxon stronghold; literally a "neighborhood".
 
ButteryNext to the kitchen, a room from where wine was dispensed.
 
ButtressWall projection for extra support; flying - narrow, arched bridge against the structure; pilaster - gradually recedes into the structure as it ascends.
 
CapitalDistinctly treated upper end of a column.
 
CarotidHeart-shaped.
 
CasematesArtillery emplacements in separate protected rooms, rather than in a battery.
 
CesspitThe opening in a wall in which the waste from one or more garderobes was collected.
 
ChamferSurface made by smoothing off the angle between two stone faces.
 
ChancelThe space surrounding the altar of a church.
 
Chemise wallFormed by a series of interlinked or overlapping semicircular bastions.
 
ChevronZig-zag moulding.
 
ChoirThe part of a cruciform church east of the crossing.
 
ClaspingEncasing the angle.
 
ClunchHard chalky material.
 
CobUnburned clay mixed with straw.
 
ColumnPillar (circular section).
 
ConcentricHaving two sets of walls, one inside the other.
 
CopingCovering stones.
 
CorbelA projecting block of stone built into a wall during construction; step-wise construction, as in an arch, roof, etc.
 
CorinthianElaborately foliated capital.
 
CorniceDecorative projection along the top of a wall.
 
CounterguardA long, near-triangular freestanding fortification within the moat.
 
CounterscarpOuter slope of ditch.
 
CourseLevel layer of stones or bricks.
 
CrannogCeltic Scotland timber-built fortified lake village.
 
Creasingþ-shaped mark on a wall, marking the pitch of a former roof.
 
CrenelThe low segment of the alternating high and low segments of a battlement.
 
CrenelationBattlements at the top of a tower or wall.
 
CrocketCurling leaf-shape.
 
Cross-and-orbModified cross slits to accommodate gunnery.
 
CrosswallInterior dividing wall; structural.
 
CrownworkFreestanding bastioned fortification in front of main defenses.
 
CupolaHemispherical armored roof.
 
Curtain WallA connecting wall hung between two towers surrounding the bailey.
 
CushionCapital cut from a block by rounding off the lower corners.
 
CuspCurves meeting in a point.
 
CyclopeanDrystone masonry, ancient, of huge blocks.
 
DaubA mud of clay mixture applied over wattle to strengthen and seal it.
 
Dead-groundClose to the wall, where the defenders can't shoot.
 
Diaper workDecoration of squares or lozenges.
 
DiaphragmWall running up to the roof-ridge.
 
Dog-leggedWith right-angle bends.
 
DogtoothDiagonal indented pyramid.
 
DonjonA great tower or keep.
 
DormerWindow placed vertically in sloping roof.
 
Double-splayedEmbrasure whose smallest aperture is in the middle of the wall.
 
DrawbridgeA heavy timber platform built to span a moat between a gatehouse and surrounding land that could be raised when required to block an entrance.
 
DressingCarved stonework around openings.
 
Drum TowerA large, circular, low, squat tower built into a wall.
 
DrystoneUnmortared masonry.
 
DungeonThe jail, usually found in one of the towers.
 
EmbattledBattlemented; crenelated.
 
EmbrasureThe low segment of the altering high and low segments of a battlement.
 
EnceinteThe enclosure or fortified area of a castle.
 
FascineHuge bundle of brushwood for revetting ramparts or filling in ditches.
 
FilletNarrow flat band.
 
FinialA slender piece of stone used to decorate the tops of the merlons, spire, tower, balustrade, etc.
 
FlutingConcave mouldings in parallel.
 
FoliatedCarved with leaves.
 
FootingsBottom part of wall.
 
ForebuildingAn extension to the keep, guarding it's entrance.
 
FosseDitch.
 
FreestoneHigh quality sand- or lime-stone.
 
FrescoPainting on wet plaster wall.
 
GableWall covering end of roof ridge.
 
GalleryLong passage or room.
 
GarderobeA small latrine or toilet either built into the thickness of the wall or projected out from it; ; projects from the wall as a small, rectangular bartizan.
 
Gate HouseThe complex of towers, bridges, and barriers built to protect each entrance through a castle or town wall.
 
GlacisA bank sloping down from a castle which acts as a defence against invaders; broad, sloping naked rock or earth on which the attackers are completely exposed.
 
Great chamberLord's solar, or bed-sitting room.
 
Great HallThe building in the inner ward that housed the main meeting and dining area for the castle's residence; throne room.
 
GroinedRoof with sharp edges at intersection of cross-vaults.
 
Half-shaftRoll-moulding on either side of opening.
 
Half-timberThe common form of medieval construction in which walls were made of a wood frame structure filled with wattle and daub.
 
HallPrincipal room or building in complex.
 
HerringboneBrick or stone laid in alternate diagonal courses.
 
HillfortBronze or iron age earthwork defenses of concentric ditches and banks.
 
HoardingUpper wooden stories on a stone castle wall; the living area; sometimes, a temporary wooden balcony suspended from the tops of walls from which missiles could be dropped.
 
HoodArched covering; when used as umbrella, called hood-mould.
 
HornworkFreestanding quadrilateral fortification in front of the main wall.
 
ImpostWall bracket to support arch.
 
Inner CurtainThe high wall the surrounds the inner ward.
 
Inner WardThe open area in the center of a castle.
 
JambSide posts of arch, door, or window.
 
JoggledKeyed together by overlapping joints.
 
JoistWall-to-wall timber beams to support floor boards.
 
KeepA strong stone tower; main tower; donjon; stronghold.
 
KeystoneCentral wedge in top of arch.
 
LancetLong, narrow window with pointed head.
 
LanternSmall structure with open or windowed sides on top of a roof or dome to let light or air into the enclosed space below.
 
LatticeLaths or lines crossing to form a network.
 
LiasGreyish rock which splits easily into slabs.
 
LightGlazing; component part of window, divided by mullions and transoms.
 
LintelHorizontal stone or beam bridging an opening.
 
LoopholeNarrow, tall opening, wallslit for light, air, or shooting through.
 
LouvreOpening in roof (sometimes topped with lantern) to allow smoke to escape from central hearth.
 
LozengeDiamond shape.
 
MachicolationsProjecting gallery on brackets, on outside of castle or towers, with holes in floor for dropping rocks, shooting, etc.
 
MantletDetached fortification preventing direct access to a gateway; low outer wall.
 
MerlonThe high segment of the alternating high and low segments of a battlement.
 
MeurtriereAn opening in the roof of a passage where soldiers could shoot into the room below. Also see "Murder Holes".
 
MoatA deep trench usually filled with water that surrounded a castle.
 
MolineEnds curling outward.
 
MortarA mixture of sand, water, and lime used to bind stones together; as opposed to drylaid masonry.
 
MotteA mound of earth on which a tower was built; artificial conical earth mound (sometimes an old barrow) for the keep.
 
Motte-&-baileyEarth mound with wood or stone keep, surrounded by ditched and palisaded enclosure (or courtyard).
 
Moulding Masonry decoration; long, narrow, casts strong shadows.
 
MullionVertical division of windows.
 
MuralWall (adjectival).
 
Murder HolesA section between the main gate and a inner portcullis where arrows, rocks, and hot oil can be dropped from the roof though holes. Provides good cover for defenders and leaves the attacker open. Only used when outer gate has been breach.
 
NailheadPyramid moulding.
 
NarthexEnclosed passage between the main entrance and nave of a church; vestibule.
 
NavePrincipal hall of a church, extending from the narthex to the chancel.
 
NeckingOrnament at the top of a column, bottom of the capital.
 
NewelCenter post of spiral staircase.
 
NookshaftShaft set in angle of jamb or pier.
 
OffsetLedge marking the narrowing of a wall's thickness.
 
OiletteA round opening at the base of a loophole, usually for a cannon muzzle.
 
Open jointWide space between faces of stones.
 
OratoryPrivate in-house chapel; small cell attached to a larger chapel.
 
OrderOne of a series of concentric mouldings.
 
OrielProjecting window in wall; originally a form of porch, usually of wood; side-turret.
 
OrillonsArrowhead bastions.
 
OublietteA dungeon reached by a trap door; starvation hole.
 
Outer CurtainThe wall the encloses the outer ward.
 
Outer WardThe area around the outside of and adjacent to the inner curtain.
 
O”liteGranular limestone.
 
PalisadeA sturdy wooden fence usually built to enclose a site until a permanent stone wall can be constructed.
 
PalmetteLooped like a palm-leaf.
 
ParadosLow wall in inner side of main wall.
 
ParapetLow wall on outer side of main wall.
 
PedimentLow-pitched gable over porticos, doors, windows.
 
PeelA small tower; typically, a fortified house on the border.
 
PelletCircular boss.
 
PerpendicularEnglish architectural style (1330-1540).
 
Petit appareilSmall cubical stonework.
 
PierSupport for arch, usually square.
 
PilasterShallow pier used to buttress a wall.
 
PinnacleOrnamental crowning spire, tower, etc.
 
PiscinaHand basin with drain, usually set against or into a wall.
 
PitchRoof slope.
 
PitchingRough cobbling on floor, as in courtyards.
 
PlinthProjecting base of wall.
 
PortcullisA heavy timber or metal grill that protected the castle entrance and could be raised or lowered from within the castle. It dropped vertically between grooves to block passage or barbican, or to trap attackers.
 
Postern GateA side or less important gate into a castle; usually for peacetime use by pedestrians
 
ProwAcute-angled projection.
 
PuddledMade waterproof.
 
PutlogBeams placed in holes to support a hoarding; horizontal scaffold beam.
 
Putlog HoleA hole intentionally left in the surface of a wall for insertion of a horizontal pole.
 
QuadrangleInner courtyard.
 
QuirkV-shaped nick.
 
QuoinDressed stone at angle of building.
 
RampartDefensive stone or earth wall surrounding castle.
 
RathLow, circular ringwork.
 
RavelinOutwork with two faces forming a salient angle; like in a star-shaped fort.
 
Re-entrantRecessed; opposite of salient.
 
Rear-archArch on the inner side of a wall.
 
RedoubtSmall self-contained fieldwork, a refuge for soldiers outside the main defenses.
 
ReededParallel convex mouldings.
 
RefectoryCommunal dining hall.
 
Relieving archArch built up in a wall to relieve thrust on another opening.
 
RespondHalf-pier bonded into a wall to carry an arch.
 
RetirataImprovised fieldwork to counter an imminent breach.
 
RevetmentRetaining wall to prevent erosion; to face a surface with stone slabs.
 
RibRaised moulding dividing a vault.
 
RingworkCircular earthwork of bank and ditch.
 
RollMoulding of semi-circular section.
 
RomanesqueThe prevailing architectural style, 8-12th cent.; massive masonry, round arches, small windows, groin-and barrel-vault.
 
RoofridgeSummit line of roof.
 
RubbleFill; unsquared stone not laid in courses.
 
RusticationWorked ashlar stone with the faces left rough.
 
SalientWall projection, arrowhead.
 
Sally-portSmall heavily fortified side door from which the defenders can rush out, strike, and retire.
 
SaltireDiagonal, equal-limbed cross.
 
ScaffoldingThe temporary wooden frame work built next to a wall to support both workers and materials.
 
ScaleCarving resembling overlapping fish scales.
 
ScallopCarved in a series of semi-circles.
 
ScappledCut to a smooth face.
 
ScarpSlope on inner side of ditch.
 
SegmentalLess than a semi-circle.
 
Set back/offLedge on wall face.
 
ShaftNarrow column.
 
Shell-keepCircular or oval wall surrounding inner portion of castle; usually stores and accommodations inside the hollow walls.
 
SillLower horizontal face of an opening.
 
SleeperSleeper
 
SoffitUnderside of arch, hung parapet, or opening.
 
SolarUpper living room , often over the great hall; the lord's private living room.
 
SpandrelArea between top of a column or pier and the apex of the arch springing from it.
 
SplayChamfer, or sloping face.
 
SpringLevel at which the springers (voussoirs) of an arch rise from their supports.
 
SquintObservation hole in wall or room.
 
SteppedRecessed in a series of ledges.
 
SteynedLined (like in a well).
 
StockadeSolid fence of heavy timbers.
 
StringcourseContinuous horizontal moulding on wallface.
 
Tau crossPlain T cross with equal limbs.
 
Tooth-inStones removed (or omitted) to allow another wall to be bonded into it.
 
TraceryIntersecting ribwork in upper part of window.
 
TransomHorizontal division of window; crossbar.
 
TrefoilThree-lobed.
 
TrussA timber frame used to support the roof over the great hall.
 
TufaCellular rock; porous limestone.
 
Turning bridgeA drawbridge that pivots in the middle.
 
TurretSmall tower, round or polygonal; usually a lookout.
 
TympanumSpace between lintel and arch over doorway.
 
VaultStone roofing.
 
VitrifiedMaterial reduced to glass by extreme heat.
 
VoluteSpiral scroll at angle of a capital.
 
VoussoirWedge-shaped stones in arch.
 
Wall-plateHorizontal roof-timber on wall-top.
 
Wall-stairStaircase built into the thickness of a wall.
 
Wall-walkPassage along castle wall; may be roofed.
 
Water-leafPlain broad leaf moulding.
 
WattleA mat of woven (willow) sticks and weeds; used in wall and dike construction.
 
WaveSinuous moulding.
 
WeatheringSloping surface to throw off rainwater.
 
WicketPerson-sized door set into the main gate door.
 
Wing-wallWall downslope of motte to protect stairway.
 
YettIron lattice gate.
 


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Glossary V2.0
Castles and Fortresses from the Medieval Times