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butterweed

[buht-er-weed]
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noun
  1. any wild plant having conspicuously yellow flowers or leaves.
  2. the horseweed.
  3. a ragwort (Senecio jacobaea) or groundsel (S. vulgaris), both having yellow ray flowers.

Origin of butterweed

First recorded in 1885–90; butter + weed1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018