any of various water lilies of the genus Nuphar, having globular yellow flowers and growing in lakes or sluggish streams, especially N. advena, of the eastern U.S.
Also called cow lily.

1805–15, Americanism; spatter + dock4 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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common water lily of eastern and central North America, having broad leaves and globe-shaped yellow flowers; in sluggish fresh or slightly brackish water 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Glyphosate can provide reasonably long-term control of spatterdock, cattail,
  and willow.
Spatterdock, arrowhead, and wild rice flourish in the marsh.
Among the surface plants that do grow there are white water-lily and
It did not mind our presence as it circled around, climbed into the mud flats
  opposite us, and began munching on spatterdock.
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