Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cortĭcĕus, a, um, adj. [cortex], of bark or cork, Varr. R. R. 1, 40; 3, 16; Plin. 11, 21, 24, § 71 (cortice, Sillig); Aus. Mos. 246 al.