from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A dense igneous rock that consists mainly of olivine and is a source of magnesium.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A type of igneous rock with a coarse-grained or phaneritic texture.
from The Century Dictionary and Cyclopedia
- n. A rock consisting essentially of a crystalline granular mass of olivin with chromite or picotite, containing also frequently more or less of various other minerals, alteration products of the olivin. Dunite appears to be frequently more or less altered into serpentine.
After Mount Dun in northern South Island, New Zealand.(American Heritage® Dictionary of the English Language, Fourth Edition)