Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
crētōsus, a, um, adj. [2. creta], abounding in chalk or clay: locus, Cato, R. R. 8, 1; Plin. 15, 18, 19, § 72: terra, Varr. R. R. 1, 9, 3; Plin. 18, 19, 49, § 175: rura Cimoli, Ov. M. 7, 463.