a combining form with the meanings “having a valence” (quadrivalent ), “having homologous chromosomes” (univalent ), “having antibodies” (multivalent ), of the number specified by the initial element.

< Latin valent- (stem of valēns, present participle of valēre to be strong); see equivalent Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
-valent (ˈveɪlənt)
adj, —combining form
chem having a specified valency: bivalent; trivalent
[C19: from Latin valentia; see valency]

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

-valent suff.
Having a specified valence or valences: polyvalent.

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