Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† hălĭcācăbus, i, f. (sc. herba) = ἁλικάκαβος, a plant called in pure Latin vesicaria, Plin. 21, 31, 105, § 180; Cels. 5, 20, 3.