pumice
/ˈpʌmɪs/
noun
- 1
A light, porous type of pyroclastic igneous rock, formed during explosive volcanic eruptions when liquid lava is ejected into water or air as a froth containing masses of gas bubbles. As the lava solidifies, the bubbles are frozen into the rock.
verb
- 1
To abrade or roughen with pumice.
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