But·ter·cup n. Bot. A plant of the genus Ranunculus, or crowfoot, particularly Ranunculus bulbosus, with bright yellow flowers; -- called also butterflower, golden cup, and kingcup. It is the cuckoobud of Shakespeare.
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Cuck·oo·bud n. Bot. A species of Ranunculus (Ranunculus bulbosus); -- called also butterflower, buttercup, kingcup, goldcup.
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Ranunculus bulbosus
n : perennial Old World buttercup with golden to sulphur yellow
flowers in late spring to early summer; naturalized in
North America [syn: common buttercup]