Main Entry: pum·ice

Pronunciation: \ˈpə-məs\

Function: noun

Etymology: Middle English pomis, from Anglo-French pomice, from Latin pumic-, pumex — more at foam

Date: 15th century

: a volcanic glass full of cavities and very light in weight used especially in powder form for smoothing and polishing

— pu·mi·ceous \pyü-ˈmi-shəs, ˌpə-\ adjective