n. [ OE. buttur the bittern + 5th bump. ] (Zool.) The European bittern. Johnson. [ 1913 Webster ]
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. [ 1913 Webster ]