Definition of magmatist in English:

magmatist

noun

Geology
  • A person who believes that most plutonic rocks, especially granites, were formed from magma rather than by metamorphic granitization.

Origin

1940s; earliest use found in Herbert Harold Read (1889–1970), geologist. From classical Latin magmat-, magma magma + -ist.

Pronunciation

magmatist

/ˈmaɡmətɪst/