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butter-and-eggs
butter bean
butter knife
butter muslin
butter slide
butter tart
butter up
butterball
butterbur
buttercup
buttercup squash
butterfat
butterfingers
butterfish
butterfly
butterfly ballot
butterfly bush
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butterbur

but·ter·bur [ búttər bùr ] (plural but·ter·burs or but·ter·bur)


noun 
Definition:
 
plant with large leaves: a waterside plant with large soft leaves. Flowers: purple. Native to: Europe, Asia.  Genus Petasites.

[Because butter was formerly wrapped in its leaves]
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