AISLE - A part of a church running parallel to a nave, choir or transept and divided from it by a row of columns

AMBULATORY - An aisle around the apse at the east end of a church

APSE - A semicircular recess usually at the east end of a church

ARCADE - A series of arches supporting or attached to a church wall

ARCHIVOLT: the molding framing an arch. In Romanesque and Gothic architecture, each one of a series of arches framing the tympanum of a portal

AUMBRY - A small cupboard recessed into the wall of a church

BARREL VAULTING - The simplest form of vaulting, it comprises a semicircular arch elongated into a tunnel and constructed out of stone or brick. A barrel vault serves either as a roof or as a support for the upper stories of a building

BASILICA - A building e.g. a church that takes the form of an oblong, colonnaded hall

BLIND ARCADE - A row of decorative arches that is attached to a wall surface and has no real openings

BUTTRESS - A support built against the wall a church

CATHEDRAL - The principal church of a diocese or city in which is to be found the bishop's throne or cathedra

CHANCEL - That part of the east end of a church where the altar is situated and which is normally reserved for the use of the clergy and choir

CHEVRON - A zigzag pattern characteristic of Romanesque decoration that is often carved around pillars, arches and doorways

CHOIR - That part of a church that is normally reserved for the use of the clergy and the choir.

CLERESTORY - The upper part of the wall of a cathedral or large church, above the arches and triforium, that containing windows to let in light and to lessen the weight of the wall

COMPOUND PILLAR - A pillar that is either made up of a solid core surrounded by a cluster of shafts, or is simply a cluster of shafts

CROSSING - The point at which the transepts cross the nave of a church

CRUCIFORM - Cross-shaped - as in the ground plan of a church with transepts

CRYPT - A vaulted underground room beneath a church which may be used either as a burial place or for storage

FINIAL - An ornament at the top of e.g. a spire

GARGOYLE - A grotesque carving, usually in the form of a human or animal, at the end of a spout designed to carry rainwater clear of the wall of a building

ILLUMINATED INITIAL - A highly decorated letter in an illuminated manuscript, often the first letter of a passage or a page

JAMB - A vertical post supporting a window frame or doorway - the side of a doorway or window frame. The jambs of the portals of Romanesque and Gothic churches are frequently decorated with figure sculpture

KEYSTONE - A voussoir i.e. a wedge-shaped or tapered stone placed at the top of an arch or vault. In vaulting it occurs at the intersection of the ribs of a ribbed vault

LECTERN - A reading desk in a church for the reading of lessons

LINTEL: a horizontal beam spanning an openings, as over a window or door, or between two posts

LOZENGE - A diamond-shaped pattern characteristic of Romanesque decoration that is often carved around pillars, arches and doorways

NAVE - The body of a church running between the aisles from the west end to the chancel or choir.

NICHE - A shallow recess in a wall designed to contain a statue or some other ornament

ORDER - A series of voussoirs - i.e. wedge-shaped or tapered stones - that together make up an arch

PINNACLE - A pointed termination of a spire, buttress, or other extremity of a building

PORTAL - A portal or doorway may incorporate one or more of the following features:Tympanum; Archivolt; Lintel; Trumeau; Jamb.

PULPIT - A raised and enclosed platform in a church from which a preacher delivers a sermon

QUATREFOIL - Ornamental tracery in the form of a flower with four symmetrical petals

RESPOND - A half pillar attached to and projecting from a wall, used to carry one end of an arch

ROMANESQUE ARCHITECTURE - A style of architecture that flourished in Western Europe between 1050 and 1200. This style derived its name from the fact that it drew much of its influence from Roman architecture. In England, it is also called the Norman style. Some of the characteristic features of this school of architecture are

* Rounded arches

* Squat, massive pillars

* Small windows

* Simple, carved decoration.

SACRISTY - In a church, the room where sacred vestments and vessels are kept

SANCTUARY - A sacred place where, in medieval times, fugitives from the law were immune from arrest

SCREEN - A partition of stone or wood or glass that separates without completely cutting off one part of a church from another part

SEDILIA - A set of stone seats close to an altar for use by the officiating priests

SPANDREL - The walling above and around the curve of an arch

SPIRE - An elongated, pointed structure that rises from a tower, turret, or roof

TRACERY - Carved stonework of interlaced and branching ribs, particularly the lace-like stonework in the upper part of a Gothic window

TRANSEPT - The transverse part of a church with a cruciform or cross-shaped floor plan

TRIFOIL - Ornamental tracery in the form of a flower with three symmetrical petals

TRIFORIUM - A gallery or arcade in the wall of a church. It is located above the arches in the nave, choir or transept

TRUMEAU - doorpost supporting lintel

TURRET - A small tower usually attached to a building

TYMPANUM - An area above a door between the lintel and the arch. Frequently carved with relief sculptures

UNDERCROFT - A crypt i.e. a vaulted underground room beneath a church which may be used either as a burial place or for storage

VAULTING - An arched structure of stone or brick supported by walls or columns and serving either as a roof or as a support for the upper stories of a building

VOUSSOIR - A wedge-shaped or tapered stone used to form an arch

Acknowledgment : http://www.dur.ac.uk/~dla0www/c_tour/glossary.html