mass noun
1- a very light and porous volcanic rock formed when a gas-rich froth of glassy lava solidifies rapidly浮岩, 浮石。
1.1
- （亦作pumice stone）[count noun] a piece of such rock used as an abrasive, especially for removing hard skin（尤指用于除去坚硬外皮的）研磨类轻石, 浮石。
派生词
pumiceous
/pjuːˈmɪʃəs/ adjective词源
late Middle English: from Old French pomis, from a Latin dialect variant of pumex, pumic-. Compare with POUNCE2.