ultramaficWiktionary 原文英美构词拆解ultraultra-前缀maficmafic词干ultra-Greater than normal quantity or importance, as in ultrasecret. · Beyond, on the far side of, as in ultraviolet.词源说明From ultra- + mafic.释义形容词adjective1(geology) Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle.名词noun1A rock with such properties.