STEP Liddell–Scott–Jones: Σινᾶ

Σινά

(-ᾶ, Rec.),

indecl. (but τὸ Σιναῖον, FlJ, Ant., iii, 5, 1; τὸ Σιναῖον ὄρος, ib. ii, 12, 1), τό

(Heb. סִינַי),

Sinai (Exo.19:11, al.): Act.7:30, 38, Gal.4:24-25†

(From Abbott-Smith. LSJ has no entry)