The Collaborative International Dictionary of English v.0.48:

Snapdragon \Snap"drag`on\, n.
   1. (Bot.)
      (a) Any plant of the scrrophulariaceous genus
          Antirrhinum, especially the cultivated Antirrhinum
          majus, whose showy flowers are fancifully likened to
          the face of a dragon.
      (b) A West Indian herb (Ruellia tuberosa) with curiously
          shaped blue flowers.
          [1913 Webster]

   2. A play in which raisins are snatched from a vessel
      containing burning brandy, and eaten; also, that which is
      so eaten. See Flapdragon. --Swift.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Antirrhinum majus
    n 1: perennial native to the Mediterranean but widely cultivated
         for its purple or pink flowers [syn: Mediterranean
         snapdragon, Antirrhinum majus]