T-square definitions
A rule having a short, sometimes sliding, perpendicular crosspiece at one end, used by drafters for establishing and drawing parallel lines.
noun
A T-shaped straightedge with a short, thick crosspiece that fits over the edge of a drawing board, used in drawing parallel lines.
noun
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.
noun