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Definition of three-square
(Entry 1 of 2)
: having an equilateral triangular cross section
—used especially of a file
three-square
nounDefinition 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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Merriam-Webster unabridgedWords at Play
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