n. The name of the letter j. It is rarely written out, the symbol j being used instead.n. Any bird of the subfamily Garrulinæ; specifically, Garrulus glandarius, a common European bird, about 13 inches long, of a gray color tinged with reddish, varied with black, white, and blue, and having the head crested.n. A loud, flashy woman.n. In actors' slang, an amateur or a poor actor.n. A general term of contempt applied to a stupid person: as, an audience at jays.n. n. In angling, a variety of artificial fly dressed with blue jay feathers.