pumice

(also `pumice-stone) n [C, U](piece of) light porous lava used for removing stains or rough patches of skin and (in powder form) for cleaning and polishing 浮岩, 浮石, 轻石（轻而多孔, 可用以去除皮肤污垢或使皮肤光滑, 其粉剂可作清洁剂或抛光剂）.

pull-in, pull-out, pull-up (Brit) (US `pull-off), pullet, pulley, pulley-block, Pullman, pullover, pulmonary, pulp, pulpit, pulpy, pulsar, pulsate, pulsation, pulse, pulverization, pulverisation, pulverize, pulverize, pulverise, puma, pummel (also pommel), pummelling, pump, pump-room, pumpernickel, pumpkin, pun, Punch, punch-ball, punch-bowl, punch-drunk, punch-line, punch-up, punchline, punchy, punctilio, punctilious, punctiliously, punctiliousness, punctual,