Sicklebill \Sic"kle*bill`\, n. (Zo["o]l.) (a) Any one of three species of humming birds of the genus {Eutoxeres}, native of Central and South America. They have a long and strongly curved bill. Called also the {sickle-billed hummer}. (b) A curlew. (c) A bird of the genus {Epimachus} and allied genera.