<p><strong>Noun</strong></p><ul><li>any of the several deciduous trees constituting the genus Castanea, of the beech family, having toothed, oblong leaves and bearing edible nuts enclosed in a prickly bur, and including C. dentata American chestnut, which has been virtually destroyed by the chestnut blight, C. sativa European chestnut, C. mollissima Chinese chestnut, and C. crenata Japanese chestnut.</li><li>the edible nut of such a tree.</li><li>the wood of any of these trees.</li><li>any fruit or tree resembling the chestnut, as the horse chestnut.</li><li>reddish-brown.</li><li>an old or stale joke, anecdote, etc.</li><li>the callosity on the inner side of the leg of a horse.</li><li>a reddish-brown horse having the mane and tail of the same color.</li><li>a horse of a solid, dark-brown color.</li></ul><p><strong>Adjective</strong></p><ul><li>being reddish-brown in color.</li><li>(of food) containing or made with chestnuts: turkey with chestnut stuffing.</li></ul>