Source : Webster's Revised Unabridged Dictionary (1913)

      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.