D defs.my
Entry 2 senses Webster, 1913

Meerschaum

/(mēr"sha̤m; 277)/ · Meer·schaum · IPA /ˈmɪər.ʃɔːm/
01 n. 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 o…
  1. 1.
    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.(Min.) Also: sepiolite
  2. 2.
    A tobacco pipe made of this mineral; a meerschaum pipe.