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auxotroph

[awk-suh-trof, -trohf] /ˈɔk səˌtrɒf, -ˌtroʊf/
noun, Biology
1.
a mutant organism, especially a microorganism, that has a nutritional requirement not shared by the parent organism.
Compare prototroph (def 1).
Origin
1950-1955
1950-55; back formation from auxotrophic; see auxo-, trophic
Related forms
auxotrophic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for auxotrophic

auxotroph

/ˈɔːksətrəʊf/
noun
1.
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

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

auxotrophic aux·o·troph·ic (awk-sō-trŏf'ĭk)
adj.
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.

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