Definitions for maficˈmæf ɪk
Random House Webster's College Dictionary
of or pertaining to rocks rich in dark, ferromagnesian minerals.
Category: Petrology, Geology
Origin of mafic:
1910–15; ma(gnesium)+ L f(errum) iron + -ic
Describing rocks, such as silicate minerals, magmas, and volcanic and intrusive igneous rocks, which contain relatively high concentrations of magnesium and iron.