WordReference Random House Unabridged Dictionary of American English © 2026
fem•ic
(fem′ik),USA pronunciation adj. [Petrol.]
- Geology, Rocksof or pertaining to a group of rock-forming minerals in which iron and magnesium are essential components. Cf. mafic.
- Latin fe(rrum) iron + m(agnesium) + -ic
- 1900–05