Mafic Definition
 măfĭk 
    adjective
  
 Of or pertaining to igneous rocks that are rich in dark-colored minerals and that contain magnesium and iron and a comparatively low level of silica.
 Webster's New World 
    noun
  
 A rock with such properties.
 Wiktionary 
Other Word Forms of Mafic
Noun
Singular:
 maficPlural:
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