ultramafic

U1L1T1R1A1M3A1F4I1C3

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.

Similar
ultrabasic
UncommonScrabble 17
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Meanings

adjectiveultramafic (comparative more ultramafic, superlative most ultramafic)

comparative more ultramafic · superlative most ultramafic

  1. geographyDescribing 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

nounultramafic (plural ultramafics)

plural ultramafics

  1. A rock with such properties.

Synonyms & antonyms

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

Similar
ultrabasic

Origin

From ultra- + mafic.

Full word history & related roots →
Cite this entry
APA

ultramafic. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/ultramafic

MLA

“ultramafic.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/ultramafic. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “ultramafic,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/ultramafic.

Source: ultramafic on Wiktionary, CC BY-SA 4.0.