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.
  ◄ ►