ul·tra·ba·sic 
(ŭl′trə-bāsĭk)
(ŭl′trə-bāsĭk)adj.
Containing magnesium and iron and only a very small amount of silica. Used of igneous rock.
| 单词 | ultrabasic |
| 释义 | ul·tra·ba·sic (ŭl′trə-bāsĭk)adj. Containing magnesium and iron and only a very small amount of silica. Used of igneous rock. |
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