A mutant microorganism that requires some nutrient that is not required by the organism (prototroph) from which the mutant was derived. Cf.:polyauxotroph, monoauxotroph. [auxo- + G. trophe, nourishment]
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auxo·troph -.trōf, -.träf n an auxotrophic strain or individual
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n.
a strain of a microorganism, derived by mutation, that requires one or more specific factors for growth not needed by the parent organism.
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auxo·troph (awkґso-trōf) an auxotrophic organism.Medical dictionary. 2011.