auxotrophic
adjective
auxo·tro·phic ˌȯk-sə-ˈtrō-fik 
: requiring a specific growth substance beyond the minimum required for normal metabolism and reproduction by the parental or wild-type strain
auxotrophic mutants of bacteria
auxotrophy
ȯk-ˈsä-trə-fē
noun 
Word History
Etymology
Greek auxein to increase + -o- + English -trophic
First Known Use
1944, in the meaning defined above
Medical Definition
auxotrophic
adjective
auxo·tro·phic ˌȯk-sə-ˈtrō-fik
: 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