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T square
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.
(noun)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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See T square in Webster's New World College Dictionary
a -shaped ruler with a short, thick crosspiece that fits over the edge of a drawing board, used in drawing parallel lines
See T square in American Heritage Dictionary 4
noun
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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T-square
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