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ultramafic

[ uhl-truh-maf-ik ]

adjective

, Geology.

ultramafic

/ ŭl′trə-măf′ĭk /

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

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Word History and Origins

Origin of ultramafic1

First recorded in 1940–45; ultra- + mafic

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ultralow frequencyultramarathon

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