Source : Webster's Revised Unabridged Dictionary (1913)

Water crowfoot \Wa"ter crow"foot`\ (Bot.)
   An aquatic kind of buttercup ({Ranunculus aquatilis}), used
   as food for cattle in parts of England.

   {Great water crowfoot}, an American water plant ({Ranunculus
      multifidus}), having deep yellow flowers.

Source : WordNet®

water crowfoot
     n : plant of ponds and slow streams having submerged and
         floating leaves and white flowers; Europe and North
         America [syn: {water buttercup}, {Ranunculus aquatilis}]