a crystalline, slightly water-soluble solid, C20H23N7O7, produced by fermentation or derived from folic acid, used in medicine in the treatment of certain anemias.
folinic acid fo·lin·ic ac·id (fō-lĭn'ĭk) n. A compound that acts as a formyl group carrier in transformylation reactions. Also called citrovorum factor, leucovorin.