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shearwater  n any of several oceanic birds of the genera Puffinus, such as P. puffinus (Manx shearwater), Procellaria, etc., specialized for an aerial or aquatic existence: family Procellariidae, order Procellariiformes (petrels) 
 (C17: so named because their wings seem to clip the waves when they are flying low) 
Manx shearwater    n 
a European oceanic bird, Puffinus puffinus, with long slender wings and black-and-white plumage: family Procellariidae (shearwaters)