noun, verb, -iced, -ic⋅ing.| 1. | Also called pumice stone. a porous or spongy form of volcanic glass, used as an abrasive. |
| 2. | to rub, smooth, clean, etc., with pumice. |

pumice pum·ice (pŭm'ĭs)
n.
A light, porous, glassy lava, used as an abrasive.
| pumice (pŭm'ĭs) Pronunciation Key
A usually light-colored, porous, lightweight rock of volcanic origin. The pores form when water vapor and gases escape from the lava during its quick solidification into rock. |