- a finely crystalline, intrusive basaltic rock made up mainly of labradorite and pyroxene
- Brit. altered dolerite
Origin of diabaseFrench from Classical Greek diabasis, a crossing over from dia- (see dia-) + bainein, to go, come
A dark-gray to black, fine-textured igneous rock composed mainly of feldspar and pyroxene and used for monuments and as crushed stone.
Origin of diabaseFrench partly from Greek diabasis a crossing over ( from diabainein to pass through or over ; see diabetes . ) and partly from diabase ( dia- two ) ( alteration of di- ) ( from Greek di- ; see di- 1. ) ( base basis ) ( from Old French; see base 1. )