Lexical Definition

‎ὄρος‎ óros (or'-os) mountain ^G:N-N
probably from an obsolete (to rise or "rear"

hill, mount(-ain).

• perhaps akin to ‎αἴρω‎
• compare ‎ὄρνις‎)
• a mountain (as lifting itself above the plain)

Abbott-Smith

ὄρος, -ους, τό, [in LXX chiefly, and very freq., for הַר;]
a mountain: Mt 4:8 17:1, Mk 9:2, Jo 4:20, II Pe 1:18, al.; opp. to βουνός, Lk 3:5(LXX); ὄ. τ. ἐλαιῶν, Mt 21:1 24:3, al. (v.s. ἐ.); ὄ. Σιών (Σ., prob. in gem appos.), He 12:22, Re 14:1; ὄ. Σινά, Ac 7:30, 38, Ga 4:24, 25; τὸ ὄ., of the hill district as distinct from the lowlands, esp. the hills above the Sea of Galilee, Mt 5:1 8:1, Mk 3:13 6:46, al.; τὰ ὄ., Mt 18:12, Mk 5:5, He 11:38, Re 6:14, al.; proverbially (cf. Rabbinic, עקר הרים), of overcoming difficulties, accomplishing marvels, ὄρη μεθιστάνειν, I Co 13:2, cf. Mt 17:20 21:21, Mk 11:23.

Abbott-Smith References

Liddell-Scott-Jones

ὄρος, εος, τό:

genitive plural ὀρέων (the form proper to Ionic dialect and other dialects) is required by the metre in [Refs 5th c.BC+], and is alone used in [LXX+2nd c.BC+]; but ὀρῶν (the Attic dialect form) is required in [Refs 5th c.BC+] for the sake of meter| in Doric dialect, [Refs 8th c.BC+], see at {ὄρειος} (οὔρεσιν is an Epicism in [Refs 7th c.BC+] at end of a hexameter, [Refs]; ὄρος is found in codices of [Refs 5th c.BC+] and should perhaps be restored elsewhere:—mountain, hill, ὄρεος κορυφῇσι [Refs 8th c.BC+]

__2 canton, parish, ὄ. Ἀργειατᾶν, ὄ. Ὀγχνιάἱον, etc., [Refs 4th c.BC+]
__3 in Egypt, desert, [Refs 1st c.AD+]; as place of burial, [Refs 1st c.AD+]
__4 part of the foot, ={τὸ ἄνω πρὸ τῶν δακτύλων}, [Refs 2nd c.AD+]
__5 ={ἀμίς}, [Refs 5th c.BC+]

_{LSJ Scripture Refs: LXX.Gen.8.5 ☩ Rev.6.15}