Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cervārĭus, a, um, adj. [cervus], of or pertaining to deer: lupus, a lynx, Plin. 8, 22, 34, § 84; 11, 37, 79, § 202: venenum, an herb with which arrows were smeared, Plin. 27, 11, 76, § 101; Fest. s. v. toxicum, p. 355: cervaria ovis, quae pro cervā immolabatur (Dianae), Fest. p. 57.