Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† cērintha, ae (-ē, ēs, Plin. 21, 12, 41, § 70), f., = κηρινθη, a plant which bees are fond of, wax-flower: Cerinthe major, Linn.; Verg. G. 4, 63; Col. 9, 8, 13.