pumice

名词 pumice:

1. a light glass formed on the surface of some lavas; used as an abrasive
   同义词：pumice stone

动词 pumice:

1. rub with pumice, in order to clean or to smoothen

pum.ice

n.（名词）
A light, porous, glassy lava, used in solid form as an abrasive and in powdered form as a polish and an abrasive.
轻石，浮石：一种在固体状时用作研磨物且粉状时用作磨光物和研磨物的轻多孔火山岩
v.tr.（及物动词）
pum.iced,pum.ic.ing,pum.ic.es
To clean, polish, or smooth with pumice.
用浮石（把某物）磨光使之变得干净、光亮或柔滑

来源：
Middle English
中古英语
from Anglo-Norman pomis
源自 英法语 pomis
from Late Latin pômex
源自 后期拉丁语 pômex
from Latin pômex
源自 拉丁语 pômex
alteration of spôma [foam]
spôma的变化 [泡沫]

【引伸】
pumi.ceous
pum.icer
n.（名词）