Source : Webster's Revised Unabridged Dictionary (1913)

Lawn \Lawn\, n. [OE. laund, launde, F. lande heath, moor; of
   Celtic origin; cf. W. llan an open, clear place, llawnt a
   smooth rising hill, lawn, Armor. lann or lan territory,
   country, lann a prickly plant, pl. lannou heath, moor.]
   1. An open space between woods. --Milton.

            ``Orchard lawns and bowery hollows.'' --Tennyson.

   2. Ground (generally in front of or around a house) covered
      with grass kept closely mown.

   {Lawn mower}, a machine for clipping the short grass of
      lawns.

   {Lawn tennis}, a variety of the game of tennis, played in the
      open air, sometimes upon a lawn, instead of in a tennis
      court. See {Tennis}.

Tennis \Ten"nis\, n. [OE. tennes, tenies, tenyse; of uncertain
   origin, perhaps fr. F. tenez hold or take it, fr. tenir to
   hold (see {Tenable}).]
   A play in which a ball is driven to and fro, or kept in
   motion by striking it with a racket or with the open hand.
   --Shak.

         His easy bow, his good stories, his style of dancing
         and playing tennis, . . . were familiar to all London.
                                                  --Macaulay.

   {Court tennis}, the old game of tennis as played within
      walled courts of peculiar construction; -- distinguished
      from lawn tennis.

   {Lawn tennis}. See under {Lawn}, n.

   {Tennis court}, a place or court for playing the game of
      tennis. --Shak.

Source : WordNet®

lawn tennis
     n : a game played with rackets by two or four players who hit a
         ball back and forth over a net that divides the court
         [syn: {tennis}]