Definition of protogine in English:

protogine

noun

Geology
  • A variety of granite occurring in the Alps, containing chlorite and often having a foliated structure resembling that of gneiss, which was formerly thought to be part of the original crust of the earth.

Origin

Early 19th century. From French protogine, irregularly from proto- + ancient Greek γίγνεσθαι (also γίνεσθαι) to be born or produced, intended to express ‘first-produced’, the rock being assumed to be the most ancient of all.