Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
† psyllĭon, ĭi, n., = ψύλλιον, a plant, fleabane, fleawort, Plin. 25, 11, 90, § 140; Cael. Aur. Acut. 3, 8, 97.