Real Dictionary

jay
countable noun: In Europe and Asia, a jay is a brownish-pink bird with blue and black wings.
countable noun: In North America, a jay is a bird with bright blue feathers.

Jay in American English
John1745-1829; Am. statesman & jurist: 1st chief justice of the U.S. (1789-95)
noun: a male given name

jay in American English 1
any of several corvids, usually strikingly colored birds, as the Eurasian jay (Garrulus glandarius) or the blue jay
noun: any of several noisy, vivacious birds of the crow family, subfamily Garrulinae, as the crested Garrulus glandarius, of the Old World, having brownish plumage with blue, black, and white barring on the wings

jay in American English 2
joint (sense 6)
noun: a marijuana cigarette

jay in British English
noun: any of various passerine birds of the family Corvidae (crows), esp the Eurasian Garrulus glandarius, with a pinkish-brown body, blue-and-black wings, and a black-and-white crest
noun: John 1745–1829, American statesman, jurist, and diplomat; first chief justice of the Supreme Court (1789–95). He negotiated the Jay's Treaty