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WordReference Random House Learner's Dictionary of American English © 2024T square, n. [countable]- BuildingaT-shaped ruler having a short crosspiece that slides along the edge of a drawing board as a guide in making parallel lines, etc.
WordReference Random House Unabridged Dictionary of American English © 2024T square, - BuildingaT-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.
Collins Concise English Dictionary © HarperCollins Publishers:: T-square n - 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
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