Source : Webster's Revised Unabridged Dictionary (1913)

Hoopoe \Hoop"oe\, Hoopoo \Hoop"oo\, n. [So called from its cry;
   cf. L. upupa, Gr. ?, D. hop, F. huppe; cf. also G.
   wiedenhopf, OHG. wituhopfo, lit., wood hopper.] (Zo["o]l.)
   A European bird of the genus {Upupa} ({U. epops}), having a
   beautiful crest, which it can erect or depress at pleasure.
   Called also {hoop}, {whoop}. The name is also applied to
   several other species of the same genus and allied genera.

Source : WordNet®

hoopoo
     n : any of several crested Old World birds with a slender
         down-curving bill [syn: {hoopoe}]