Definition of jay
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 usually crested and largely blue chiefly New World birds that are related to the common Old World jay and have roving habits and harsh voices — compare blue jay
3
:a moderate blue
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