Source : Webster's Revised Unabridged Dictionary (1913)

Water moccasin \Wa"ter moc"ca*sin\ (Zo["o]l.)
   A venomous North American snake ({Ancistrodon piscivorus})
   allied to the rattlesnake but destitute of a rattle. It lives
   in or about pools and ponds, and feeds largely of fishes.
   Called also {water snake}, {water adder}, {water viper}.

Moccasin \Moc"ca*sin\, n. [An Indian word. Algonquin makisin.]
   [Sometimes written {moccason}.]
   1. A shoe made of deerskin, or other soft leather, the sole
      and upper part being one piece. It is the customary shoe
      worn by the American Indians.

   2. (Zo["o]l.) A poisonous snake of the Southern United
      States. The water moccasin ({Ancistrodon piscivorus}) is
      usually found in or near water. Above, it is olive brown,
      barred with black; beneath, it is brownish yellow, mottled
      with darker. The upland moccasin is {Ancistrodon
      atrofuscus}. They resemble rattlesnakes, but are without
      rattles.

   {Moccasin flower} (Bot.), a species of lady's slipper
      ({Cypripedium acaule}) found in North America. The lower
      petal is two inches long, and forms a rose-colored
      moccasin-shaped pouch. It grows in rich woods under
      coniferous trees.