Lexical Definition

‎Ἰουδαῖος‎ Ioudaîos (ee-oo-dah'-yos) Jew ^N:N--PG
from ‎Ἰουδά‎ (in the sense of ‎Ἰούδας‎ as a country)

Jew(-ess), of Judæa.

• Judæan, i.e. belonging to Jehudah

Abbott-Smith

Ἰουδαῖος, -αία, -αῖον (< Ἰούδας),
Jewish: ἀνήρ, Ac 10:28 22:3; ἄνθρωπος, Ac 21:39; ψευδοπροφήτης, 13:6; ἀσχιερεύς, 19:14; γυνή, 16:1 24:24; γῆ, Jo 3:22; χώρα, Mk 1:5. Substantively,
(a) Ἰουδαῖος, ὁ, a Jew: Jo 4:9, Ac 18:24, Ro 2:28; pl., Re 2:9 3:9; οἱ Ἰ., Mt 2:2, Mk 7:3, Jo 2:6, al.; Ἰ. τε καὶ Ἕλληνες, Ac 14:1, al.; κ. προσήλυτοι, Ac 2:10; ἔθνη τε κ. Ἰ., Ac 14:5; οἱ κατὰ τὰ ἔθνη Ἰ., Ac 21:21; of Jewish Christians, Ga 2:13; of the ruling class who opposed Jesus, Jo 1:19 2:18 5:10 11:8 13:33, al.;
(b) Ἰουδαία, -ας, ἡ (sc. γῆ, χώρα, cf. Jo 3:22, Mk 1:5), (Heb. יְהוּדָה), Judæa: Mt 2:1, Lk 1:5, Jo 4:3, al.

Abbott-Smith References

Liddell-Scott-Jones

Greek of: יְהוּדִי

Ἰουδαῖος, ὁ,

a Jewish man: Ἰουδαία, a Jewish woman; ἡ Ἰουδαία (i.e. γῆ) “Judaea”: —Ἰουδα-ϊκός, ή, όν, “Jewish”, [LXX] adverb -κῶς [NT+1st c.AD+]

_{LSJ Scripture Refs: Gal.2.14}