Word.ws English Dictionary

ultramafic

ultramafic adjective: describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.

Adjective

ultramafic (comparative more ultramafic, superlative most ultramafic)

  1. Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.
    Synonyms:
    ultrabasic

Noun

ultramafic (plural ultramafics)

  1. A rock with such properties.

Synonyms of ultramafic

Forms of ultramafic

Adjective
comparativemore ultramafic
superlativemost ultramafic
Noun
pluralultramafics

Origin of ultramafic

From ultra- + mafic.

Questions about ultramafic

What does ultramafic mean?
Ultramafic means describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.
What part of speech is ultramafic?
Ultramafic can be an adjective or a noun.

Words near ultramafic in the dictionary

  1. ultraluminous
  2. ultraluxe
  3. ultraluxurious
  4. ultraluxury
  5. ultramacho
  6. ultramafic
  7. ultramafics
  8. ultramafite
  9. ultramagnetic
  10. ultramaphic
  11. ultramarathon

Source and license

Adapted from Wiktionary: ultramafic (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “ultramafic.” Word.ws, https://word.ws/ultramafic. Based on Wiktionary, CC BY-SA 4.0.