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