One of the mysteries of the English language finally explained.
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".
1940s. From scientific Latin citrovorum, former specific epithet, so called on account of its ability to metabolize citric acid.
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