diabase

[dahy-uh-beys]
noun Petrology.
  1. a fine-grained gabbro occurring as minor intrusions.
  2. British. a dark igneous rock consisting essentially of augite and feldspar; an altered dolerite.

Origin of diabase

1810–20; < French, equivalent to dia- (error for di- two) + base base1
Related formsdi·a·ba·sic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for diabase

diabase

noun
  1. British an altered dolerite
  2. US another name for dolerite
Derived Formsdiabasic, adjective

Word Origin for diabase

C19: from French, from Greek diabasis a crossing over, from diabainein to cross over, from dia- + bainein to go
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

diabase in Science

diabase

[dīə-bās′]
  1. 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
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