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We found 3 dictionaries that define the word Ultramafic rock:

General (1 matching dictionary)
  1. Ultramafic rock: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. Ultramafic rock, Ultramafic rock: Encyclopedia

Definitions from Wikipedia (Ultramafic rock)

noun:  Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are usually composed of greater than 90% mafic minerals (dark colored, high magnesium and iron content).


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