definitions

ultramafic

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

adjective Geology.

ultrabasic.

Nearby words

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

Origin of ultramafic

First recorded in 1940–45; ultra- + mafic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.