Definition of euclase
: 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
Origin and Etymology of euclase
French, from eu- (from Latin) + Greek klasis breaking, from klan to break
First Known Use: 1804
Seen and Heard
What made you want to look up euclase? Please tell us where you read or heard it (including the quote, if possible).