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ultramafic

[uhl-truh-maf-ik] /ˌʌl trəˈmæf ɪk/
adjective, Geology
Origin
1940-1945
1940-45; ultra- + mafic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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ultra mafic in Science
ultramafic
  (ŭl'trə-māf'ĭk)   
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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