butterweed

[buht-er-weed]

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noun

any wild plant having conspicuously yellow flowers or leaves.
the horseweed.
a ragwort (Senecio jacobaea) or groundsel (S. vulgaris), both having yellow ray flowers.

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Origin of butterweed

First recorded in 1885–90; butter + weed¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018