Usually means: Rocks containing very high magnesium.
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We found 12 dictionaries that define the word ultramafic:

General (10 matching dictionaries)
  1. ultramafic: Merriam-Webster
  2. ultramafic: Oxford Learner's Dictionaries
  3. ultramafic: American Heritage Dictionary of the English Language
  4. ultramafic: Collins English Dictionary
  5. ultramafic: Wordnik
  6. ultramafic: Wiktionary
  7. ultramafic: Infoplease Dictionary
  8. ultramafic: Dictionary.com
  9. Ultramafic: Wikipedia, the Free Encyclopedia
  10. ultramafic: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. ultramafic: Encyclopedia

Science (1 matching dictionary)
  1. Ultramafic: Eric Weisstein's World of Chemistry

Definitions from Wiktionary (ultramafic)

adjective:  (geology) 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.
noun:  A rock with such properties.

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