Column: A supporting pillar consisting of a base, a cylindrical shaft, and a capital.
Base: The lowest part of a structure, such as a wall, considered as a separate unit: the base of a column.
Capital: the upper part of a column that supports the entablature.
Shaft: The principal portion of a column, between the capital and the base.
Flute: A long, usually rounded groove incised as a decorative motif on the shaft of a column.
Volute: A spiral scroll-like ornament such as that used on an Ionic capital.
Abacus: A slab on the top of the capital of a column.
Echinus: A convex molding just below the abacus of a Doric capital.
Necking: A molding between the upper part of a column and the projecting part of the capital.
Astragal: A narrow convex molding often having the form of beading.
Plinth: A block or slab on which column is placed
Torus: A large convex molding, semicircular in cross section, located at the base of a classical column.
Scotia: A hollow concave molding at or near the base of a column.
Conge: An Apophyge
Fillet: A thin flat molding used as separation between or ornamentation for larger moldings.
Egg and Dart: A decorative molding consisting of a series of egg-shaped figures alternating with dart-shaped, anchor-shaped, or tongue-shaped figures.
Acanthus: Any of various perennial herbs or small shrubs of the genus Acanthus, native to the Mediterranean and having pinnately lobed basal leaves with spiny margins and showy spikes of white or purplish flowers. Also called bear's breech.