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From The Collaborative International Dictionary of English v.0.48:
Gull \Gull\, n. [Of Celtic origin; cf. Corn. gullan, W. gwylan.] (Zool.) One of many species of long-winged sea birds of the genus Larus and allied genera. [1913 Webster] Note: Among the best known American species are the herring gull (Larus argentatus), the great black-backed gull (L. murinus) the laughing gull (L. atricilla), and Bonaparte's gull (L. Philadelphia). The common European gull is Larus canus. [1913 Webster] Gull teaser (Zool.), the jager; -- also applied to certain species of terns. [1913 Webster]