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spatterdock

[spat-er-dok]
noun
  1. 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.
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Origin of spatterdock

An Americanism dating back to 1805–15; spatter + dock4
Also called cow lily.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018