συνέφηβος

A. fellow ‐ἔφηβος, Aeschin. 1.49, 2.167, IG 22.1043.70, 2127.5, OGI 188.7 (Philae), Plu. 2.482a, Charito 8.6, Luc. Tim. 48; at Sparta, member of the same ἀγέλη, IG 5(1).38, al.; Συνέφηβοι, a name of comedies by Menander and others.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project