Definition of diabase in English:

diabase

Syllabification: di·a·base
Pronunciation: /ˈdīəˌbās
 
/

noun

Geology
  • another term for dolerite.
    More example sentences
    • It is also a widespread constituent of a variety of igneous and metamorphic rocks and is occasionally found in pegmatites and in related veins marginal to igneous rock units ranging from granite to diabase.
    • The lower series consists of alternating basalt lava, tuff breccia, tufite, and siliceous rock, whereas the upper one is dominated by diabase.
    • Many such dikes in western Maine are classified as alkali diabase.

Origin

mid 19th century (originally denoting diorite): from French, formed irregularly as if from di- 'two' + base 'base' (thus 'rock with two bases', referring to the base minerals of diorite), but associated later perhaps with Greek diabasis 'transition'.

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