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auxo-

1.
a combining form meaning “growth,” “increase,” used in the formation of compound words:
auxochrome.
Also, especially before a vowel, aux-.
Origin
< Greek aúx(ein) to grow, increase (variant of auxánein) + -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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auxo- in Medicine

auxo- or aux-
pref.
Increase: auxotroph.

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