1

three–square

adjective

Definition of three–square

  1. :  having an equilateral triangular cross section —used especially of a file

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Origin and Etymology of three–square

Middle English thre sqware having three equal sides, from three, thre three + sqware, square square


2

three–square

noun

Definition of three–square

  1. 1 less commonly three–square rush [so called from the triangular stems] :  any of various rushes of the genus Scirpus; especially :  chairmaker's rush

  2. 2 :  a three-square file

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