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diabase

[dahy-uh-beys] /ˈdaɪ əˌbeɪs/
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
1810-1820
1810-20; < French, equivalent to dia- (error for di- two) + base base1
Related forms
diabasic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for diabasic

diabase

/ˈdaɪəˌbeɪs/
noun
1.
(Brit) an altered dolerite
2.
(US) another name for dolerite
Derived Forms
diabasic, adjective
Word Origin
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
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diabasic in Science
diabase
  (dī'ə-bās')   
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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