<p><strong>Noun</strong></p><ul><li>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.</li><li>Compare: blue jay, gray jay.</li><li>Informal: A simple-minded or gullible person.</li></ul>