Webster's English Dictionary

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pumice

1. pum.ice \'p*m-*s\ \pyu:-'mish-*s, .p*-\ n [ME pomis, fr. MF, fr. L 
   pumic-, pumex - more at FOAM] : a volcanic glass full of cavities and very 
   light used esp. in powder for m for smoothing and polishing - pu.mi.ceous 
   aj
2. pumice vt : to clean, smooth, or treat with pumice