Dictionary

ultrabasic

adjective ul·tra·ba·sic \ˌəl-trə-ˈbā-sik\

Definition of ULTRABASIC

:  extremely basic <an ultrabasic system>; specifically :  very low in silica and rich in iron and magnesium minerals <dunite and peridotite are ultrabasic rocks>
ultrabasic noun

Origin of ULTRABASIC

International Scientific Vocabulary
First Known Use: 1881

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