the prominent ridge over the eye, with the hair that covers it, forming an arch above the orbit.-the hair that covers the brow (ridge over the eyes); the eyebrow.-the forehead; as, a feverish brow.-the general air of the countenance.-the edge or projecting upper part of a steep place; as, the brow of a precipice; the brow of a hill.-to bound to limit; to be at, or form, the edge of.