auxotroph

[awk-suh-trof, -trohf]

aux·o·troph

[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).

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

aux·o·troph·ic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Auxotroph is always a great word to know.
So is ally. Does it mean:
the merging of two or more cells into a single cell
a plant, animal, or other organism bearing an evolutionary relationship to another, often as a member of the same family
Collins
World English Dictionary
auxotroph (ˈɔːksətrəʊf)
 
n
a mutant strain of microorganism having nutritional requirements additional to those of the normal organism
 
auxo'trophic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

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.

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