Definition of muttonbird
: any of several Australasian sea birds often used (as by the Maori) for their meat, oil, and feathers: such as a (1) : a short-tailed shearwater (Puffinus tenuirostris) of Australia and New Zealand (2) : a sooty shearwater (Puffinus griseus) of New Zealand b : any of several petrels (as Pterodroma macroptera, P. lessoni, and P. neglecta)
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