Extended Strong's Greek Lexicon (Abbott-Smith based)
founder
Usage: ἀρχηγός, -όν [in LXX for רֹאשׁ, נָשִׂיא etc. ;] beginning, originating: more freq., as subst.; __1. founder, author (Lat. auchor; so sometimes in π., see MM, see word; Milligan, NTD, 75): Act.3:15 (R, mg.), Heb.2:10 (R, txt.; but see Westc., in l, and Page, Ac., l.with). __2. prince, leader (so in MGr., see Kennedy, Sources, 153): Act.3:15 (R, txt.) Act.5:31, Heb.2:10 (cf. R, mg.) 122 (Cremer, 117).† (AS)