[awk-suh-trof, -trohf]
noun Biology.
a mutant organism, especially a microorganism, that has a nutritional requirement not shared by the parent organism. Compare prototroph ( def 1 ).

1950–55; back formation from auxotrophic; see auxo-, trophic

auxotrophic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
auxotroph (ˈɔːksətrəʊf)
a mutant strain of microorganism having nutritional requirements additional to those of the normal organism

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

auxotroph aux·o·troph (ôk'sə-trŏf', -trōf')
A mutated microorganism having nutritional requirements that differ from those of unmutated microorganisms from the same strain.

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