pūmex icis, m (once f
, Ct.), a pumice-stone: liber pumice mundus, polished, H.: geminae poliantur pumice frontes (libelli), O., Ct.: pumice crura terere (to smooth the skin), O.—A rock with cavities, porous rock, hollowed cliff, lava bed: latebroso in pumice nidi, O.: cavi, V.: Quae oppositis debilitat pumicibus mare, H.