three-square

[ three-skwair ]
/ ˈθriˈskwɛər /

adjective

having an equilateral triangular cross section, as certain files.

Origin of three-square

1400–50; late Middle English thre square threefold, modeled on foursquare

Example sentences from the Web for three-square

British Dictionary definitions for three-square

three-square

adjective

having a cross section that is an equilateral triangle a three-square file