pumice به انگلیسی
From Longman Dictionary
pum‧ice /ˈpʌmɪs/ (also pumice stone) noun
[uncountable] very light grey rock from a volcano that is crushed to a powder and used for cleaning
[غیر قابل شمارش] سنگ خاکستری بسیار روشن از آتشفشانی که به پودر تبدیل می شود و برای تمیز کردن استفاده می شود
[countable] a piece of pumicestone that you rub on your skin to clean it or make it soft
[قابل شمارش] تکهای از سنگ پا که روی پوستتان میمالید تا تمیز شود یا نرم شود.
Example
Treat calluses by rubbing with a callus file, a pumice stone, or a hard-skin remover
You should file calluses and corns with a pumice stone, but never cut them with sharp instruments
If such vesicles are extremely abundant pumice is formed
The hardest, pumice, is used in a number of proprietary compounds
No pumice will float indefinitely, though