Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
glārĕōsus, a, um, adj. [glarea], full of gravel, gravelly: terra, Varr. R. R. 1, 9, 3: sabulosaque arva, Col. 2, 10, 23: loca, id. Arb. 21, 1: rivi, Plin. 26, 8, 56, § 88: flumen saxa glareosa volvens, Liv. 21, 31, 11 dub. (al. globosa).