Source : Webster's Revised Unabridged Dictionary (1913)

Snakehead \Snake"head`\, n.
   1. A loose, bent-up end of one of the strap rails, or flat
      rails, formerly used on American railroads. It was
      sometimes so bent by the passage of a train as to slip
      over a wheel and pierce the bottom of a car.

   2. (Bot.)
      (a) The turtlehead.
      (b) The Guinea-hen flower. See {Snake's-head}, and under
          {Guinea}.

Source : WordNet®

snakehead
     n : showy perennial of marshlands of eastern and central North
         America having waxy lanceolate leaves and flower with
         lower part creamy white and upper parts pale pink to deep
         purple [syn: {shellflower}, {shell-flower}, {turtlehead},
          {snake-head}, {Chelone glabra}]