Aventurine :: Aventurine (n.) A kind of glass, containing gold-colored spangles. It was produced in the first place by the accidental (par aventure) dropping of some brass filings into a pot of melted glass..
Aventurine :: Aventurine (n.) A variety of translucent quartz, spangled throughout with scales of yellow mica..
Barbituric Acid :: Barbituric acid () A white, crystalline substance, CH2(CO.NH)2.CO, derived from alloxantin, also from malonic acid and urea, and regarded as a substituted urea..