noun Date: 1795 a bar or piece of material (as of wood, metal, or plastic) with a straight edge for testing straight lines and surfaces or for cutting along or drawing straight lines
STRAIGHTEDGE
Meaning of STRAIGHTEDGE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012