Shear·wa·ter n. Zool. Any one of numerous species of long-winged oceanic birds of the genus Puffinus and related genera. They are allied to the petrels, but are larger. The Manx shearwater (Puffinus Anglorum), the dusky shearwater (Puffinus obscurus), and the greater shearwater (Puffinus major), are well-known species of the North Atlantic. See Hagdon.
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Hag·don n. Zool. One of several species of sea birds of the genus Puffinus; esp., Puffinus major, the greater shearwarter, and Puffinus Stricklandi, the black hagdon or sooty shearwater; -- called also hagdown, haglin, and hag. See Shearwater.
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