προαγωνιστής

οῦ, ὁ
A. one who fights for another, champion, Str. 16.4.25, Ph. 2.312,542, Luc. Salt. 14, Jul. Or. 2.87a; π. τῆς δημοκρατίας Poll. 4.34.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project