Source : Webster's Revised Unabridged Dictionary (1913)

Sea \Sea\, n. [OE. see, AS. s[=ae]; akin to D. zee, OS. & OHG.
   s[=e]o, G. see, OFries. se, Dan. s["o], Sw. sj["o], Icel.
   s[ae]r, Goth. saiws, and perhaps to L. saevus firce, savage.
   [root] 151 a.]
   1. One of the larger bodies of salt water, less than an
      ocean, found on the earth's surface; a body of salt water
      of second rank, generally forming part of, or connecting
      with, an ocean or a larger sea; as, the Mediterranean Sea;
      the Sea of Marmora; the North Sea; the Carribean Sea.

   2. An inland body of water, esp. if large or if salt or
      brackish; as, the Caspian Sea; the Sea of Aral; sometimes,
      a small fresh-water lake; as, the Sea of Galilee.

   3. The ocean; the whole body of the salt water which covers a
      large part of the globe.

            I marvel how the fishes live in the sea. --Shak.

            Ambiguous between sea and land The river horse and
            scaly crocodile.                      --Milton.

   4. The swell of the ocean or other body of water in a high
      wind; motion of the water's surface; also, a single wave;
      a billow; as, there was a high sea after the storm; the
      vessel shipped a sea.

   5. (Jewish Antiq.) A great brazen laver in the temple at
      Jerusalem; -- so called from its size.

            He made a molten sea of ten cubits from brim to
            brim, round in compass, and five cubits the height
            thereof.                              --2 Chron. iv.
                                                  2.

   6. Fig.: Anything resembling the sea in vastness; as, a sea
      of glory. --Shak.

            All the space . . . was one sea of heads.
                                                  --Macaulay.

   Note: Sea is often used in the composition of words of
         obvious signification; as, sea-bathed, sea-beaten,
         sea-bound, sea-bred, sea-circled, sealike, sea-nursed,
         sea-tossed, sea-walled, sea-worn, and the like. It is
         also used either adjectively or in combination with
         substantives; as, sea bird, sea-bird, or seabird, sea
         acorn, or sea-acorn.

   {At sea}, upon the ocean; away from land; figuratively,
      without landmarks for guidance; lost; at the mercy of
      circumstances. ``To say the old man was at sea would be
      too feeble an expression.'' --G. W. Cable

   {At full sea} at the height of flood tide; hence, at the
      height. ``But now God's mercy was at full sea.'' --Jer.
      Taylor.

   {Beyond seas}, or {Beyond the sea} or {the seas} (Law), out
      of the state, territory, realm, or country. --Wharton.

   {Half seas over}, half drunk. [Colloq.] --Spectator.

   {Heavy sea}, a sea in which the waves run high.

   {Long sea}, a sea characterized by the uniform and steady
      motion of long and extensive waves.

   {Short sea}, a sea in which the waves are short, broken, and
      irregular, so as to produce a tumbling or jerking motion.
      

   {To go to sea}, a adopt the calling or occupation of a
      sailor.