Dictionary.com

ultramafic

[ uhl-truh-maf-ik ]
/ ˌʌl trəˈmæf ɪk /
Save This Word!
adjective Geology.
ultrabasic.
QUIZ
QUIZ YOURSELF ON "WAS" VS. "WERE"!
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
true
false
TAKE THE QUIZ TO FIND OUT

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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