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From: Webster's Revised Unabridged Dictionary (1913)

 Port n.
 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.