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A Linnean genus of Procellariidæ, or petrels, formerly conterminous with the family, later variously restricted, now usually confined to the very small black-and-white species known as Mother Carey's chickens, as P. pelagica, the stormy petrel: in this restricted sense synonymous with Thalassidroma of Vigors. See cut under petrel.
(noun)
The Century Dictionary (Public Domain)