noun Etymology: French, from Montmorillon, commune in western France Date: 1854 a soft clayey water-absorbent mineral that is a hydrous aluminum silicate, montmorillonitic adjective
MONTMORILLONITE
Meaning of MONTMORILLONITE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012