noun Petrology.
a fine-grained gabbro occurring as minor intrusions.
British. a dark igneous rock consisting essentially of augite and feldspar; an altered dolerite.

1810–20; < French, equivalent to dia- (error for di- two) + base base1

diabasic, adjective
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World English Dictionary
diabase (ˈdaɪəˌbeɪs)
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- + bainein to go]

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American Heritage
Science Dictionary
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.
The American Heritage® Science Dictionary
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