auxo·tro·phic \ˌȯksəˈtrōfik, -äf-\adjective (-es) Etymology:auxo- + -trophic : requiring a specific growth substance beyond the minimum required for normal metabolism and reproduction of the parental or wild-type strain < auxotrophic mutants of bacteria > • aux·ot·ro·phy\ȯkˈsätrəfē\noun