Dun, a. [AS. dunn, of Celtic origin; cf. W. dwn, Ir. & Gael. donn.] Of a dark color; of a color partaking of a brown and black; of a dull brown color; swarthy.
Summer's dun cloud comes thundering up. Pierpont.
Chill and dun
Falls on the moor the brief November day. Keble.
Dun crow(Zoöl.), the hooded crow; — so called from its color; — also called hoody, and hoddy. — Dun diver(Zoöl.), the goosander or merganser.