T square


noun

a T-shaped ruler, used primarily in mechanical drawing, having a short crosspiece that slides along the edge of the drawing board as a guide to the perpendicular longer section in making parallel lines, right angles, etc., and as a support for triangles.

Origin of T square

First recorded in 1775–85

Example sentences from the Web for t-square

British Dictionary definitions for t-square

T-square

noun

a T-shaped ruler used in mechanical drawing, consisting of a short crosspiece, which slides along the edge of the drawing board, and a long horizontal piece: used for drawing horizontal lines and to support set squares when drawing vertical and inclined lines