ultrabasic

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

|Updated on: 12 May 2018

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

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ultrabasic

noun

Recent Examples of ultrabasic from the Web

Rwanda has introduced ultrabasic health insurance for more than 90% of its people; infant mortality has fallen from 120 per 1,000 live births in 2000 to under 30 last year.

— The Economist, "Universal health care, worldwide, is within reach," 28 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ultrabasic.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.