ultramafic

[ uhl-truh-maf-ik ]

adjectiveGeology.

Origin of ultramafic

1
First recorded in 1940–45; ultra- + mafic

Words Nearby ultramafic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

Scientific definitions for ultramafic

ultramafic

[ ŭl′trə-măfĭk ]


  1. Containing mainly mafic minerals. Used of igneous rocks and often used interchangeably with ultrabasic. Dunite is an ultramafic rock.

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