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A dense igneous rock that consists mainly of olivine and is a source of magnesium.
[After Mount Dun in northern South Island, New Zealand.]
du·nit′ic (do͞o-nĭt′īk, də-) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Geological Science) an ultrabasic igneous rock consisting mainly of olivine
[C19: named after Dun Mountain, a mountain in New Zealand where it is abundant]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
du•nite(ˈdu naɪt, ˈdʌn aɪt)
a coarse-grained igneous rock composed almost entirely of olivine.
[1865–70; after Mt. Dun in New Zealand]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.