adjective Geology.

1940–45; ultra- + mafic

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American Heritage
Science Dictionary
ultramafic   (ŭl'trə-māf'ĭk)  Pronunciation Key 
Containing mainly mafic minerals. Used of igneous rocks and often used interchangeably with ultrabasic. Dunite is an ultramafic rock.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Ultramafic magmas produce sulfide ore with higher nickel-copper ratios than mafic magmas.
Typically, a layered mafic-ultramafic intrusion consists of two main sections: an ultramafic series and a mafic series.
The chemical composition of igneous rock can be broken into four main types: felsic, intermediate, mafic and ultramafic.
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