Definition of mafic in English:

mafic

Syllabification: maf·ic
Pronunciation: /ˈmafik
 
/

adjective

Geology
  • Relating to, denoting, or containing a group of dark-colored, mainly ferromagnesian minerals such as pyroxene and olivine. Often contrasted with felsic.
    More example sentences
    • Variably serpentinized Devonian mafic and ultramafic intrusive rocks occur in the western and northern parts of the map area.
    • The alternating bands of mafic and felsic minerals are a striking and distinctive feature of all gneisses.
    • If such adiabatic freezing were to control the ascent of hydrous mafic magmas, basalts would probably never erupt in volcanic arcs.

Origin

early 20th century: blend of magnesium and a contracted form of ferric.

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a small amount; a little