丁てい定じょう規ぎ

noun

T-square

A T-shaped ruler used in technical drawing for drawing horizontal lines and as a support for triangles. The cross-reference to Ｔ定規 indicates an alternative spelling.

See also: Ｔ定規

• 製せい図ずの授じゅ業ぎょうで丁てい定じょう規ぎを使つかって平へい行こう線せんを引ひいた。

  In drafting class, I drew parallel lines using a T-square.