citrovorum
/sɪtrəˈvɔːrəm/Biology and Medicine
noun
A substance required for the growth of the lactic acid bacterium Leuconostoc cremoris (formerly L. citrovorum), subsequently identified as folinic acid and used to modify or mitigate the effects of methotrexate and other chemotherapeutic agents. Chiefly attributive, especially in citrovorum factor.
Origin
1940s. From scientific Latin citrovorum, former specific epithet, so called on account of its ability to metabolize citric acid.