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BarEASTON'S
Used to denote the means by which a door is bolted (Neh. 3:3); a rock in the sea (Jonah 2:6); the shore of the sea (Job 38:10); strong fortifications and powerful impediments, etc. (Isa. 45:2; Amos 1:5); defences of a city (1 Kings 4:13). A bar for a door was of iron (Isa. 45:2), brass (Ps. 107:16), or wood (Nah. 3:13).
Easton's Illustrated Bible Dictionary, 3rd ed. (1897), public domain.