Where does “ād-” come from?

ād- (Proto-Balto-Slavic) comes from Proto-Indo-European h₂edʰ-, from Proto-Indo-European h₂eǵ- — to drive.

Ancestry of “ād-”, step by step

StepLanguageWordMeaning
1Proto-Indo-Europeanh₂edʰ-—
2Proto-Indo-Europeanh₂eǵ-to drive
Every word from Proto-Indo-European h₂eǵ- →Every word from Proto-Indo-European h₂edʰ- →