a combining form meaning “four,” used in the formation of compound words: quadrilateral.
Also quadra-, quadru-; especially before a vowel, quadr-.

Origin of quadri-

< Latin; akin to quattuor four
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for quadri-


before a vowel quadr-

combining form

fourquadrilateral; quadrilingual; quadrisyllabic

Word Origin for quadri-

from Latin; compare quattuor four
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for quadri-


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).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for quadri-



The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.