Definitions for "Auxotroph"
A mutant microorganism that can grow only when supplied with a nutrient that is not needed by the wild type.
(awks´ o trofe) [Gr. auxanein: to grow + trophe: food] • A mutant form of an organism that requires a nutrient or nutrients not required by the wild type, or reference, form of the organism. (Contrast with prototroph.)
A microorganism that has lost the ability to synthesize an essential nutrient (Lecture: The Bacterial Cell: Structure, Function, Growth, and Gene Regulation II, 1/29/02)