Definition of magmatic in US English:

magmatic

adjective

  • See magma

    • ‘In the upper parts of both granites, the magmatic foliation lies in a subhorizontal orientation.’
    • ‘The magmatic fabric of a plutonic rock forms during a relatively short time interval, after ascent and before final crystallization of magma.’
    • ‘In central and northern Sardinia there is evidence of an Ordovician magmatic belt upon older basement interpreted as an Andean-type volcanic arc.’
    • ‘Thin-section analysis shows that the minerals forming the magmatic foliation do not show any signs of deformation or recrystallization.’
    • ‘Rifting was associated with magmatic activity.’

Pronunciation

magmatic

/mæɡˈmædɪk//maɡˈmadik/