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diabasic

 - 2 dictionary results

di⋅a⋅base

  [dahy-uh-beys]
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–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:
1810–20; < F, equiv. to dia- (error for di- two) + base base 1

Related forms:
di⋅a⋅ba⋅sic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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