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three-square

adjective

Definition of three-square

 (Entry 1 of 2)

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

three-square

noun

Definition of three-square (Entry 2 of 2)

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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History and Etymology for three-square

Adjective

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

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