a white, yellowish, or pink compact earthy mineral consisting of hydrated magnesium silicate: used to make tobacco pipes and as a building stone. Formula: Mg2Si3O6(OH)4
2.
a tobacco pipe having a bowl made of this mineral
Word origin
C18: German, literally: sea foam
meerschaum in American English
(ˈmɪrʃəm; ˈmɪrˌʃɔm)
noun
1.
a soft, claylike, orthorhombic mineral, Mg4(Si2O5)3(OH)2·6H2O, used to make tobacco pipes and other heat-resistant items; hydrous magnesium silicate; sepiolite
2.
a pipe with a bowl made of this
Word origin
Ger, lit., sea foam (< meer, sea + schaum, foam), transl. of ML spuma maris, orig. used of coral, calque of Gr halos hachnē: name transferred in 18th-c. Ger to a variety of lithomarge