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definitions

ultramafic

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

adjective Geology.

ultrabasic.

Nearby words

  1. ultraleftist,
  2. ultraliberal,
  3. ultraligation,
  4. ultralight,
  5. ultralow frequency,
  6. ultramarathon,
  7. ultramarine,
  8. ultrametamorphism,
  9. ultramicrobalance,
  10. 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.