Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vermis, is, m. [Gr. ἕλμις; cf. Sanscr. krmis, worm; Goth. vaùrms, serpent], a worm, Lucr. 2, 871; 2, 928; 3, 719; 3, 723; Plin. 18, 17, 45, § 159; 24, 5, 11, § 18; 30, 13, 39, § 114; Col. 6, 30 fin.