Definitions for ultrabasicˌʌl trəˈbeɪ sɪk
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Random House Webster's College Dictionary
ul•tra•ba•sicˌʌl trəˈbeɪ sɪk(adj.)
(of rocks) containing iron and magnesium, with little or no silica.
Category: Geology, Petrology
Origin of ultrabasic:
1890–95
Wiktionary
ultrabasic(Adjective)
ultramafic
Citation
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"ultrabasic." Definitions.net. STANDS4 LLC, 2013. Web. 20 Jun 2013. <http://www.definitions.net/definition/ultrabasic>.