SINCE 1828
three-square
adjectiveDefinition 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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