Definition of jay
- jay Noun Any one of the numerous species of birds belonging to several genera within the family Corvidae, including "Garrulus", "Cyanocitta", allied to the crows, but smaller, more graceful in form, often handsomely colored, usually having a crest, and often noisy.
- jay Noun Other birds of similar appearance and behavior.
- jay Noun A dull or ignorant person. It survives today in the term jaywalking.