[jay] n [ME, fr. MF jai, fr. LL gaius] (14c) 1 a: a predominantly fawn-colored Old World bird (Garrulus glandarius) of the crow family with a black-and-white crest and wings marked with black, white, and blue b: any of various usu. crested and largely blue chiefly New World birds that are related to the common Old World jay and have roving habits and harsh voices
2. a: an impertinent chatterer b: dandy 1 c: greenhorn
3: a moderate blue
[2]jay n (ca. 1889) 1: the letter j
2: joint
4.