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/ˈdaɪ.əˌbeɪs/ · noun
(geology) A fine-grained igneous rock composed mostly of pyroxene and feldspar..
Use diabase when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Diabase means (geology) A fine-grained igneous rock composed mostly of pyroxene and feldspar..
Common synonyms include dolerite.
The opposite depends on the specific sense.
Use diabase where its definition matches the intended context.
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