Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vermĭnōsus, a, um, adj. [vermis], full of worms, wormy: fici, Plin. 17, 28, 47, § 261: ulcera, id. 26, 14, 87, § 145: auris, id. 20, 14, 52, § 146.