[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.

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.

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