a combining form meaning “four,” used in the formation of compound words:
combining form
four: quadrilateral, quadrilingual, quadrisyllabic

before vowels quad- (before -p- often quadru-, from an older form in Latin), word-forming element meaning “four, four times, having four, consisting of four,” from Latin quadri-, related to quattor “four” (see four).

quadri- or quadr-


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