n.
Pronunciation: ə - ' ven-ch ə - ˌ r ē n, -r ə n
Function: noun
Etymology: French, from aventure chance ― more at ADVENTURE
Date: 1811
1 : glass containing opaque sparkling particles of foreign material (as copper or chromic oxide)
2 : a translucent quartz spangled throughout with scales of mica or other mineral