Dictionary.com Thesaurus.com

auxotroph vs. prototroph

auxotroph

[awk-suh-trof, -trohf] / ˈɔk səˌtrɒf, -ˌtroʊf /

noun

Biology.

a mutant organism, especially a microorganism, that has a nutritional requirement not shared by the parent organism.

prototroph

[proh-tuh-trof, -trohf] / ˈproʊ təˌtrɒf, -ˌtroʊf /

noun

Biology.

a microorganism that has the same nutritional requirements as the parent organism.
an organism or cell capable of synthesizing all its metabolites from inorganic material, requiring no organic nutrients.