[ uhl-truh-maf-ik ]
/ ˌʌl trəˈmæf ɪk /
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Scientific definitions for ultramafic
[ ŭl′trə-măf′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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.