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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a chattering or flighty, light-headed person. |
| diabase (ˈdaɪəˌbeɪs) | |
| —n | |
| 1. | (Brit) an altered dolerite |
| 2. | (US) another name for dolerite |
| [C19: from French, from Greek diabasis a crossing over, from diabainein to cross over, from | |
| dia'basic | |
| —adj | |
| diabase (dī'ə-bās') Pronunciation Key
A dark-gray to black, medium-grained igneous rock consisting mainly of labradorite and pyroxene. Diabase is compositionally similar to andesite, but has coarser grains. It is commonly found in sills and dikes. Also called dolerite. |