Where does “diagnose” come from?

diagnose (Indonesian) comes from Dutch diagnose, from French diagnose, from Latin diagnōsis, from Ancient Greek διάγνωσις, from Ancient Greek διαγιγνώσκω, from Ancient Greek δῐᾰ-, from Ancient Greek διά, from Proto-Indo-European dwís — two.

Ancestry of “diagnose”, step by step

Step	Language	Word	Meaning
1	Dutch	diagnose	diagnosis
2	French	diagnose	diagnosis
3	Latin	diagnōsis	—
4	Ancient Greek	διάγνωσις	distinguishing
5	Ancient Greek	διαγιγνώσκω	to discern; distinguish, discern
6	Ancient Greek	δῐᾰ-	apart; through, across; through; in different...
7	Ancient Greek	διά	throughout
8	Proto-Indo-European	dwís	twice, doubly; in two
9	Proto-Indo-European	dwóh₁	two

Every word from Proto-Indo-European dwóh₁ →Every word from Ancient Greek δῐᾰ- →Every word from Proto-Indo-European dwís →