Abbott-Smith Manual Greek Lexicon
γνωστός (G1110)
15 γνωστός , -ή, -όν , later form of γνωστός ( γιγνώσκω ), [in LXX for various parts of ידע ;] known : Ac 9:42 ; c. dat., Jo 18:15 , 16 (Rec.), Ac 1:19 2:14 4:10 13:38 15:18 19:17 28:22 , 28 ; γ. σημεῖον , a notable (EV) sign , one that is matter of knowledge, Ac 4:16 ; γνωστὸν , Ac 15:17 , 18 ; τὸ γνωστὸν θεοῦ , Ro 1:19 ; in pl., as subst., γνωστοί , acquaintances , Lk 2:44 23:49 ; so in sing., Jo 18:16 (WH).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain