[ uhl-truh-maf-ik ]
/ ˌʌl trəˈmæf ɪk /
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Science 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.
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