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countable and uncountable, plural pumices
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, which are frozen into the rock as the lava solidifies. quotations examples
The wind blew close to the ground - it rooted among the tussock grass - slithered along the road, so that the white pumice dust swirled in our faces - settled and sifted over us and was like a dry-skin itching for growth on our bodies.
1912, Katherine Mansfield, The Woman at the Store, Oxford World's Classics 2002, page 10
third-person singular simple present pumices, present participle pumicing, simple past and past participle pumiced
(transitive) To abrade or roughen with pumice. examples