threesquare

three-square

[three-skwair]
adjective
having an equilateral triangular cross section, as certain files.

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

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World English Dictionary
three-square
 
adj
having a cross section that is an equilateral triangle: a three-square file

Collins English Dictionary - Complete & Unabridged 10th Edition
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