The story
- Proto-Indo-European*per-der.?
- Proto-Indo-European*pér
- Proto-Indo-European*pró
- Ancient Greekπρό (pró)
- Ancient Greekπρο- (pro-)
- Proto-Indo-European*ǵneh₃-
- Proto-Indo-European*ǵneh₃tis
- Ancient Greekγνῶσις (gnôsis)
- Ancient Greekγνωστῐκός (gnōstĭkós)
- Ancient Greekπρο- (pro-)
- Ancient Greekγνῶσῐς (gnôsĭs)
- Ancient Greekπρόγνωσῐς (prógnōsĭs)
- Ancient Greekπρογνωστῐκός (prognōstĭkós)
- Medieval Latinprognosticus
- Medieval Latinprognosticare
- Englishprognosticate
- English todayprognosticator
From prognosticate + -or.
Etymology from Wiktionary, CC BY-SA 4.0.