T-square definitions

tē'skwâr'
A rule having a short, sometimes sliding, perpendicular crosspiece at one end, used by drafters for establishing and drawing parallel lines.
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A T-shaped straightedge with a short, thick crosspiece that fits over the edge of a drawing board, used in drawing parallel lines.
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The definition of a T square is a t-shaped ruler with a thick piece at one end that can slide on an edge used for making straight, parallel lines.

An example of a T square is what an architect would use on their draft table when making straight lines in a building design.

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