One of the bright or luminous spots or streaks on the surface of the sun, as distinguished from the dark spots or maculæ.

Astronomy. A small, luminous, and short-lived patch on the surface of the sun; = facula, n. Also called willow leaf. Now rare.

Astronomy. One of the small cloudy wisps or masses on the sun's surface, revealed when the sun is photographed with the spectroheliograph.