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buttercup (n.)

common name of a type of small wildflower with a yellow bloom, 1777, perhaps (OED) a merger of two older names, gold-cups and butterflower. See butter (n.) + cup (n.).

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Definitions of buttercup from WordNet

buttercup (n.)
any of various plants of the genus Ranunculus;
Synonyms: butterflower / butter-flower / crowfoot / goldcup / kingcup
From wordnet.princeton.edu