Main Entry: ze·o·lite

Pronunciation: \ˈzē-ə-ˌlīt\

Function: noun

Etymology: Swedish zeolit, from Greek zein to boil + -o- + Swedish -lit -lite, from French -lite — more at yeast

Date: circa 1777

: any of various hydrous silicates that are analogous in composition to the feldspars, occur as secondary minerals in cavities of lavas, and can act as ion-exchangers; also : any of various natural or synthesized silicates of similar structure used especially in water softening and as adsorbents and catalysts

— ze·o·lit·ic \ˌzē-ə-ˈli-tik\ adjective