meerschaum

meerschaum is a   Noun

Definition:

[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.

[2] A tobacco pipe made of this mineral.

Synonyms: