pumice definition by Wordo

Noun

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

.

Verb

To

abrade

or

roughen

with

pumice

.