Abbott-Smith Manual Greek Lexicon
ὦ (G5599)
19 ὦ interj., c. vocat., O ; in simple address (less freq. than in cl.; M, Pr. , 71); Ac 1:1 18:14 27:21 , Ro 2:1 , 3 9:20 , I Ti 6:20 ; expressing reproof, Ja 2:20 ; in exclamations of surprise, etc.: Mt 15:28 , Lk 24:25 , Ac 13:10 , Ro 11:33 , Ga 3:1 ; c. nom. (Bl., § 33, 4), Mt 17:17 , Mk 9:19 , Lk 9:41 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain