pūmĭcōsus, a, um, adj. [pumex],
like pumice-stone , i. e. porous : terra, Plin. 17, 5, 3, § 34; Vitr. 2, 3: lapis, Plin. 36, 19, 34, § 141. — Comp. : halcyoneum, Plin. 32, 8, 27, § 86.