1. An ornament in the frieze of the Doric order, repeated at equal intervals.

Each triglyph consists of a rectangular tablet, slightly projecting, and divided nearly to the top by two parallel and perpendicular gutters, or channels, called glyphs, into three parts, or spaces, called femora.

A half channel, or glyph, is also cut upon each of the perpendicular edges of the tablet.

2. An ornament in a Doric frieze, consisting of a projecting block having on its face two parallel vertical glyphs or grooves and two half grooves or chamfers (furrows or grooves) on either vertical end, which separates the metopes (spaces between two triglyphs on a Doric frieze).