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auxo-

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  1. a combining form meaning “growth,” “increase,” used in the formation of compound words: auxochrome.
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Also especially before a vowel, aux-.

Origin of auxo-

< Greek aúx(ein) to grow, increase (variant of auxánein) + -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
auxo- in Medicine

auxo-

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