The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of several Old World birds of the family Upupidae, especially Upupa epops, having distinctively patterned plumage, a fanlike crest, and a slender, downward-curving bill.
n. An Old World bird, Upupa epops, known for its distinctive plumage, fanlike crest, and slender bill.
the GNU version of the Collaborative International Dictionary of English
n. A European bird of the genus Upupa (Upupa epops), having a beautiful crest, which it can erect or depress at pleasure, and a slender down-curving bill. Called also hoop, whoop. The name is also applied to several other species of the same genus and allied genera.
The Century Dictionary and Cyclopedia
n. A tenuirostral non-passerine bird of the family Upupidæ.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any of several crested Old World birds with a slender downward-curved bill
Word Usage
"Of all birds that hatch for themselves the hoopoe is the only one that builds no nest whatever; it gets into the hollow of the trunk of a tree, and lays its eggs there without making any sort of nest."