Abbott-Smith Manual Greek Lexicon
Σινά (G4614)
4 Σινά ( -ᾶ , Rec.), indecl. (but τὸ Σιναῖον , FlJ, Ant. , iii, 5, 1; τὸ Σιναῖον ὄρος , ib. ii, 12, 1), τό (Heb. סִינַי ), Sinai ( Ex 19:11 , al.): Ac 7:30 , 38 , Ga 4:24, 25 .†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain