Definition of micropegmatitic in English:

micropegmatitic

Pronunciation /ˌmʌɪkrə(ʊ)pɛɡməˈtɪtɪk/

adjective

Geology
  • Designating or relating to a microscopic or very fine pegmatitic rock structure.

Origin

Late 19th century; earliest use found in Archibald Geikie (1835–1924), geologist and historian. From micro- + pegmatitic, probably after French micro-pegmatite micropegmatite.