- 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
Example Sentences Including 'T-square'
There were no questions asked, he just walked up to me and whacked me on the head with a T-square.
Botham - My Autobiography
Use a T-square or plumbline to establish a true vertical.
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