Sundial \Sun"di`al\, n.
   An instrument to show the time of day by means of the shadow
   of a gnomon, or style, on a plate.
   [1913 Webster]

   Sundial shell (Zool.), any shell of the genus Solarium. See
      Solarium.
      [1913 Webster]

	

	sundial
    n 1: timepiece that indicates the daylight hours by the shadow
         that the gnomon casts on a calibrated dial