1

three-square

adjective

Definition of three-square

: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 or less commonly three-square rush
[so called from the triangular stems]
:any of various rushes of the genus Scirpus; especially :chairmaker's rush
2 :a three-square file

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