n. & v.
--n. (in full pumice-stone)
1. a light porous volcanic rock often used as an abrasive in cleaning or polishing substances.
2 a piece of this used for removing hard skin etc.
--v.tr. rub or clean with a pumice.
Derivatives:
pumiceous adj.
Etymology: ME f. OF pomis f. L pumex pumicis (dial. pom-): cf. POUNCE(2)