Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
căvernōsus, a, um, adj. [caverna], full of hollows or cavities: radix, Plin. 26, 8, 37, § 58; 27, 5, 17, § 34: meatus vocis, Prua Ham. 319.