From an unused root (meaning to be elevated); a citadel (from its height) -- castle, palace. Compare harmown.
see HEBREW harmown
H759. armon
אַרְמוֺן noun masculineIsaiah 32:14 citadel — ׳א absolute Jeremiah 30:18 +; construct Isaiah 25:2; plural אַרְמְנוֺת absolute Amos 3:9 (twice in verse); construct 1:4 +; אַרְמְנוֺתֵינוּ Micah 5:4 +, etc. — citadel, castle, palace, not used before royal period, mostly in prophets, especially common in Amos & Jeremiah; citadel as securely barred (in simile) Proverbs 18:19; ׳א הַמֶּלֶךְ בֵּית i.e. the citadel, stronghold 1 Kings 16:18, compare 2 Kings 15:25; usually more General, of castle, palaces, prominent buildings; especially used in speaking of conquest, because the fine buildings would be especially object of attack & plunder; palaces of Israel Amos 6:8; of Jerusalem Isaiah 32:14 (singular collective) Lamentations 2:5, 7; 2 Chronicles 36:19; Psalm 48:4; 48:14; 122:7 compare Hosea 8:14; Micah 5:4; Amos 2:5; Jeremiah 17:27; of Samaria Amos 3:10-11, also Jeremiah 6:5; 9:20 belonging to Benhadad (i.e. Aram) Amos 1:4; Jeremiah 49:27; of Tyre Isaiah 23:13; Amos 1:10; of Babylon Isaiah 25:2 (singular collective), compare 13:22 where read אַרְמְנוֺתָיו for אלמנותיו so ᵑ9 ᵑ7 ᵑ6 Che Di ("" היכלים; compare Ezekiel 19:7 according to ᵑ7 and others, but see rather מעון; DlBD xi defends ᵑ0 in 19:7 & compare Assyrian almattu, fortress); of Edom Isaiah 34:13, of Gaza Amos 1:7, of Rabbah 1:14, of Bozrah 1:12, of Kerioth 2:2, of Ashdod 3:9, of Egypt 3:9.