Definition of ranunculus
: any of a large genus (Ranunculus of the family Ranunculaceae, the buttercup family) of chiefly perennial herbaceous plants with tuberous or fibrous roots and typically yellow, five-petaled, cup-shaped flowers and including one (R. asiaticus) of southeastern Europe and southwestern Asia widely cultivated for its white, yellow, pink, red, or orange flowers having multiple layers of petals — see buttercup, lesser celandine
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Merriam-Webster unabridged
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The first known use of ranunculus was in 1543
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