Abbott-Smith Manual Greek Lexicon
ὄναρ (G3677)
6 * ὄναρ , τό , indecl., used only in nom, and acc. sing. (the other cases are supplied by ὄνειρος ), a dream : κατ’ ὄ. (in later writers only), in a dream , Mt 1:20 2:12 , 13 , 19 , 22 27:19 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain