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Webster 1913 Edition

Noun.

[G.

smectit

, fr. Gr. [GREEK][GREEK][GREEK][GREEK][GREEK] a kind of fuller’s earth, fr. [GREEK][GREEK][GREEK][GREEK][GREEK] to wipe off.]

(Min.)

A hydrous silicate of alumina, of a greenish color, which, in certain states of humidity, appears transparent and almost gelatinous.

Noun.

An argillaceous earth; so called from its property of taking grease out of cloth, &c.

smectite ‎(plural smectites)

(mineralogy) Any of many clay phyllosilicate minerals that have a relatively open structure