ultra mafic

ultramafic

[uhl-truh-maf-ik]
adjective Geology.

Origin:
1940–45; ultra- + mafic

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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
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