ἀρχηγικός

ή, όν, τά
A. original, primary, principal, αἴτιον Ph. 2.168 (Sup.), cf. Max.Tyr. 17.8 (Sup.), Syrian. in Metaph. 65.17, Procl. in Alc. p.250C., Jul. Or. 5.175b (Comp.); ‐κά,τά, Procl. Inst. 70.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project