• WordNet 3.6
    • n ivorybill large black-and-white woodpecker of southern United States and Cuba having an ivory bill; nearly extinct
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Webster's Revised Unabridged Dictionary
    • n ivorybill (Zoöl) A large, handsome, black-and-white North American woodpecker (Campephilus principalis), having a large, sharp, ivory-colored beak. Its general color is glossy black, with white secondaries, and a white dorsal stripe. The male has a large, scarlet crest. It is now rare, and found only in the Gulf States and Cuba.
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Century Dictionary and Cyclopedia
    • n ivorybill The ivory-billed woodpecker, Campophilus principalis: so called from the ivory-like hardness and whiteness of the bill. See cut under Campophilus. Coues.
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In science:

Units of meaning such as “the ivorybil led woodpecker ” are split in an incorrect way, wrongly increasing the number of matching tokens used for computing recall scores.
Improving Update Summarization by Revisiting the MMR Criterion