a type of grey stone that comes from volcanoes and is very light in weight. It is used in powder form for cleaning and polishing, and in pieces for rubbing on the skin to make it softer. 浮岩，浮石（一种火山玻璃，其粉末用于清洁抛光以及使皮肤光滑） Oxford Collocations DictionaryPumice is used before these nouns:- stone
Word Originlate Middle English: from Old French pomis, from a Latin dialect variant of pumex, pumic-.
