Argillôsus, pen. prod. Adiectiuum. Plin. Full of such clay.Locus argillosus. Plin. Colles argillosi. Colum. Argilletum.A place where clay is digged: a clay pit.
Lewis and Short: Latin dictionary
argillōsus, a, um, adj. [id.], full of clay, abounding in clay: terra, Varr. R. R. 1, 9, 2; so Plin. 12, 14, 30, 31, and Vulg. 3 Reg. 7, 46; ib. 2 Par. 4, 17: collis, Col. Arb. 17.