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

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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

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