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

< Latin; akin to quattuor four

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World English Dictionary
quadri- or (before a vowel) quadr-
combining form
four: quadrilateral; quadrilingual; quadrisyllabic
[from Latin; compare quattuor four]
quadr- or (before a vowel) quadr-
combining form
[from Latin; compare quattuor four]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

quadri- or quadr-

  1. Four: quadriplegia.

  2. Square: quadrate.

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