ultramafic

[ uhl-truh-maf-ik ]
/ ˌʌl trəˈmæf ɪk /

adjective Geology.

ultrabasic.

Origin of ultramafic

First recorded in 1940–45; ultra- + mafic

Words nearby ultramafic

ultraleftist, ultraliberal, ultraligation, ultralight, ultralow frequency, ultramafic, ultramarathon, ultramarine, ultrametamorphism, ultramicrobalance, ultramicrochemistry

Scientific definitions for ultramafic

ultramafic
[ ŭl′trə-măf′ĭk ]

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