Protuberance /(?)/

Pro·tu·ber·ance

Protuberance

n.
  1. That which is protuberant swelled or pushed beyond the surrounding or adjacent surface; a swelling or tumor on the body; a prominence; a bunch or knob; an elevation.

Phrases & Compounds
Solar protuberances
certain rose-colored masses on the limb of the sun which are seen to extend beyond the edge of the moon at the time of a solar eclipse. They may be discovered with the spectroscope on any clear day. Called also solar prominences. See Illust. in Append.