Main Entry: eu·clase

Pronunciation: \ˈyü-ˌklās, -ˌklāz\

Function: noun

Etymology: French, from eu- (from Latin) + Greek klasis breaking, from klan to break

Date: 1804

: a mineral that consists of a brittle silicate of beryllium and aluminum in pale yellow, green, or blue prismatic crystals and is used especially as a gemstone