What is "port bar"

Port \Port\, n. [AS. port, L. portus: cf. F. port. See Farm, v., Ford, and 1st, 3d, & 4h Port.]

1. A place where ships may ride secure from storms; a sheltered inlet, bay, or cove; a harbor; a haven. Used also figuratively.

   Peering in maps for ports and piers and roads.
   --Shak.

   We are in port if we have Thee.
   --Keble.

2. In law and commercial usage, a harbor where vessels are admitted to discharge and receive cargoes, from whence they depart and where they finish their voyages.

   Free port. See under Free.

   Port bar. (Naut,) (a) A boom. See Boom, 4, also Bar,

3. (b) A bar, as of sand, at the mouth of, or in, a port.

   Port charges (Com.), charges, as wharfage, etc., to which a ship or its cargo is subjected in a harbor.

   Port of entry, a harbor where a customhouse is established for the legal entry of merchandise.

   Port toll (Law), a payment made for the privilege of bringing goods into port.

   Port warden, the officer in charge of a port; a harbor master.

Port \Port\, n. [F. porte, L. porta, akin to portus; cf. AS. porte, fr. L. porta. See Port a harbor, and cf. Porte.]

1. A passageway; an opening or entrance to an inclosed place; a gate; a door; a portal. [Archaic]

   Him I accuse The city ports by this hath entered.
   --Shak.

   Form their ivory port the cherubim Forth issuing.
   --Milton.

2. (Naut.) An opening in the side of a vessel; an embrasure through which cannon may be discharged; a porthole; also, the shutters which close such an opening.

   Her ports being within sixteen inches of the water.
   --Sir W. Raleigh.

3. (Mach.) A passageway in a machine, through which a fluid, as steam, water, etc., may pass, as from a valve to the interior of the cylinder of a steam engine; an opening in a valve seat, or valve face.

   Air port, Bridle port, etc. See under Air, Bridle, etc.

   Port bar (Naut.), a bar to secure the ports of a ship in a gale.

   Port lid (Naut.), a lid or hanging for closing the portholes of a vessel.

   Steam port, & Exhaust port (Steam Engine), the ports of the cylinder communicating with the valve or valves, for the entrance or exit of the steam, respectively.