The story
- Proto-Indo-European*dwóh₁
- Proto-Indo-European*trísinflu.
- Proto-Indo-European*dwís
- Ancient Greekδιά (diá)
- Ancient Greekδια- (dia-)
- Proto-Indo-European*ǵneh₃-
- Proto-Indo-European*ǵn̥h₃sḱéti
- Proto-Hellenic*gignṓskō
- Ancient Greekγῐγνώσκω (gĭgnṓskō)
- Ancient Greekδῐαγῐγνώσκω (dĭagĭgnṓskō)
- Ancient Greekδῐᾰ́γνωσῐς (dĭắgnōsĭs)
- Latindiagnōsis
- English todaydiagnosis
From Latin diagnōsis, from Ancient Greek διάγνωσις (diágnōsis), from διαγιγνώσκω (diagignṓskō, “to discern”), from διά (diá, “through”) + γιγνώσκω (gignṓskō, “to know”).
Etymology from Wiktionary, CC BY-SA 4.0.