meer·schaum /ˈmɪrʃəm, ˌʃɔm/
  海泡石,海泡石的煙管
  Meer·schaum n.
  1. Min. A fine white claylike mineral, soft, and light enough when in dry masses to float in water.  It is a hydrous silicate of magnesia, and is obtained chiefly in Asia Minor.  It is manufacturd into tobacco pipes, cigar holders, etc. Also called sepiolite.
  2. A tobacco pipe made of this mineral; a meerschaum pipe.
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  meerschaum
       n 1: a white clayey mineral [syn: sepiolite]
       2: a pipe having a bowl made of meerschaum