Etymology
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quadrangular (adj.)

"four-cornered, four-sided," early 15c., quadrangulere, from Medieval Latin quadrangularis "having four corners," from Late Latin quadrangulus "having four angles" (see quadrangle). Related: Quadrangularly.

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Definitions of quadrangular

quadrangular (adj.)
of or relating to or shaped like a quadrangle;
From wordnet.princeton.edu