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[awk-suh-trof, -trohf] /ˈɔk səˌtrɒf, -ˌtroʊf/
noun, Biology.
a mutant organism, especially a microorganism, that has a nutritional requirement not shared by the parent organism.
Compare prototroph (def 1).
Origin of auxotroph
1950-55; back formation from auxotrophic; see auxo-, trophic
Related forms
auxotrophic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for auxotrophic


a mutant strain of microorganism having nutritional requirements additional to those of the normal organism
Derived Forms
auxotrophic, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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auxotrophic in Medicine

auxotrophic aux·o·troph·ic (awk-sō-trŏf'ĭk)
Requiring one or more specific substances for growth and metabolism that the parent organism was able to synthesize on its own. Used with respect to organisms, such as strains of bacteria, algae, or fungi, that can no longer synthesize certain growth factors because of mutational changes.

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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