pum ‧ ice /ˈpʌməs, ˈpʌmɪs/ BrE AmE ( also ˈpumice stone ) noun
[ Date: 1400-1500 ; Language: Old French ; Origin: pomis , from Latin pumex 'foam' ]
1 . [uncountable] very light grey rock from a ↑ volcano that is crushed to a powder and used for cleaning
2 . [countable] a piece of pumice stone that you rub on your skin to clean it or make it soft