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quadrilateral (n.)
"four-sided," 1640s, with
-al
(1) + Latin
quadrilaterus
, from
quadri-
"four" (from PIE root
*kwetwer-
"four") +
latus
(genitive
lateris
) "the side, flank" (see
latero-
). As an adjective from 1650s. Related:
Quadrilaterally
.
