Pertaining to an auxotroph.
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auxo·tro·phic .ȯk-sə-'trō-fik adj requiring a specific growth substance beyond the minimum required for normal metabolism and reproduction of the parental or wild-type strain <\auxotrophic bacterial mutants> compare prototrophic
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auxo·tro·phic (awk″so-troґfik) [auxo- + -trophic] 1. requiring a growth factor that is not required by the parental or prototype strain; said of microbial mutants. 2. requiring specific organic growth factors in addition to the carbon source present in a minimal medium.Medical dictionary. 2011.