Source : Webster's Revised Unabridged Dictionary (1913)

Saucer \Sau"cer\, n. [F. sauci[`e]re, from sauce. See {Sauce}.]
   1. A small pan or vessel in which sauce was set on a table.
      [Obs.] --Bacon.

   2. A small dish, commonly deeper than a plate, in which a cup
      is set at table.

   3. Something resembling a saucer in shape. Specifically:
      (a) A flat, shallow caisson for raising sunken ships.
      (b) A shallow socket for the pivot of a capstan.

Source : WordNet®

saucer
     n 1: something with a round shape like a flat circular plate
          [syn: {disk}, {disc}]
     2: a small shallow dish for holding a cup at the table
     3: directional antenna consisting of a parabolic reflector for
        microwave or radio frequency radiation [syn: {dish}, {dish
        aerial}, {dish antenna}]
     4: a disk used in throwing competitions [syn: {discus}]