auxotroph

詳細解釋：

aux.o.troph

n.（名詞）
An organism, such as a strain of bacteria, that has lost the ability to synthesize certain substances required for its growth and metabolism as the result of mutational changes.
營養缺陷型：一種有機體，如細菌菌株，因某種突變的結果而失去合成某種生長及代謝所需物質的能力

來源：
Back-formation from auxotrophic
源自 auxotrophic的逆構詞