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ultra basic

 - 2 dictionary results

ul⋅tra⋅ba⋅sic

[uhl-truh-bey-sik]
–adjective
(of rocks) containing iron and magnesium, with little or no silica.


Origin:
1890–95; ultra- + basic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Science Dictionary
ultrabasic   (ŭl'trə-bā'sĭk)  Pronunciation Key 
Containing magnesium and iron and only a very small amount of silica. Used of igneous rock, and often used interchangeably with ultramafic. Peridotite is an ultrabasic rock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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