Corbel: a block of stone, often elaborately carved, which projects from a wall to sustain a weight, especially that of roof-beams, or vaulting shafts. See Console.
Corinthian: latest order of Hellenic architecture, commenced by the Hellenic architects and fully developed by the Romans.
Cornice: specifically, in Classic architecture, the crowning or uppermost member of an entablature; generally, the crowning feature of any wall construction, or doors and windows.
Coro: the space screened off for the use of the choir in a Spanish cathedral, situated in the nave, west of the Crossing.
Corridor: a wide gallery or passage within a building, usually with rooms opening into it.
Cortile: Italian term for interior court, open to the sky and surrounded by arcades.
Course: a continuous horizontal layer of stones or bricks. See Bond.
Cove: specifically, the concave surface that may occur between the top of an interior wall and the flat of the ceiling.
Crenellated: fortified with battlements.
Cromlech: a prehistoric memorial, composed of stones of huge size, disposed in one or more circles; e.g., Stonehenge.