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ultrabasic

[ uhl-truh-bey-sik ]

adjective

  1. (of rocks) containing iron and magnesium, with little or no silica.


ultrabasic

/ ˌʌltrəˈbeɪsɪk /

adjective

  1. (of such igneous rocks as peridotite) containing less than 45 per cent silica
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

ultrabasic

/ ŭl′trə-bāsĭk /

  1. Containing magnesium and iron and only a very small amount of silica. Used of igneous rock, and often used interchangeably with ultramafic. Peridotite is an ultrabasic rock.
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Word History and Origins

Origin of ultrabasic1

First recorded in 1890–95; ultra- + basic
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Example Sentences

Back then, the No.1 game — and maybe the only game on a device — was the ultrabasic monochrome maze puzzle, Snake.

These range from acid to ultrabasic types and include granite, augite-diorite, picrite and serpentine.

In the form of isolated grains the mineral is a characteristic constituent of ultrabasic igneous rocks, namely the peridotites and the serpentines which have resulted from their alteration.

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ultraultracentenarian