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ultramafic

adj, noun — 2 senses

ultramafic

adj

Etymology From ultra- + mafic.

1

Geography, Geology, Natural sciences 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

ultramafic

noun

Etymology From ultra- + mafic.

1

A rock with such properties.

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.