tesserae

Small cubes of marble or stone used in mosaic.

throat

Groove in an under-surface, designed to prevent water running back across it.

through stone

Bonder stone that extends through the thickness of a wall.

tooled

having a dressed finish showing tool marks.

toothing

Masonry units left projecting or recessed in alternate courses to bond with future work.

tracery

The ornamental intersecting work in a window, screen, or panel, or used decoratively

in blank arches and vaults.

transept

The transverse arms of a cross-shaped church.

transom

Horizontal member of a window.

tread

Horizontal surface of a step.

triglyphs

Projecting blocks with vertical grooves between the metopes in a Doric frieze.

tympanum

The space contained within a triangular pediment.