Gūles, n.

(gūlz), n. [Fr. gueules, from L. Lat. gula, reddened skin.] (Her.) A red color; red;—intended, perhaps, to represent courage, animation, or hardihood, and indicated in engraved figures of escutcheons and the like by straight perpendicular lines.

Full on this casement shone the wintery moon, And threw warm gules on Madeline's fair breast. Keats.