Pronunciation: (prom'u-nuns),[key] —n. 1. Also,prom'i•nen•cy.the state of being prominent; conspicuousness.
2. something that is prominent; a projection or protuberance: a prominence high over a ravine. 3. Also called solar prominence.Astron.an eruption of a flamelike tongue of relatively cool, high-density gas from the solar chromosphere into the corona where it can be seen during a solar eclipse or by observing strong spectral lines in its emission spectrum.