Source : Webster's Revised Unabridged Dictionary (1913)

Cuckoobud \Cuck"oo*bud"\ (k??k"??-b?d`), n. (Bot.)
   A species of {Ranunculus} ({R. bulbosus}); -- called also
   {butterflower}, {buttercup}, {kingcup}, {goldcup}. --Shak.