prominence

[prom-uh-nuhns]
noun
1.
Also, prominency. 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. Astronomy. 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.

Origin:
1590–1600; < Latin prōminentia a jutting out, protuberance. See prominent, -ence

nonprominence, noun
overprominence, noun


2. promontory, height, precipice, peak.
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World English Dictionary
prominence (ˈprɒmɪnəns)
 
n
1.  the state or quality of being prominent
2.  something that is prominent, such as a protuberance
3.  relative importance or consequence
4.  astronomy an eruption of incandescent gas from the sun's surface that can reach an altitude of several hundred thousand kilometres. Prominences are visible during a total eclipse. When viewed in front of the brighter solar disc, they are called filaments

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

prominence
1590s, from Fr. prominence (16c.), from L. prominentia "a jutting out" (see prominent).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

prominence prom·i·nence (prŏm'ə-nəns)
n.

  1. The quality or condition of being prominent.

  2. A small projection or protuberance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
prominence   (prŏm'ə-nəns)  Pronunciation Key 
An eruption of tonguelike clouds of glowing ionized gas extending from the Sun's chromosphere and sometimes reaching hundreds of thousands of kilometers into space. When viewed against the solar surface instead of along the edges of its disk, prominences appear as dark, sinuous lines known as filaments. Usually associated with sunspot activity, solar prominences can influence Earth's atmosphere by interfering with electromagnetic activity. ◇ Active prominences erupt suddenly and usually disappear within minutes or hours. Quiescent prominences form more smoothly and can last for several months. See also solar flare.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Seen along the edge of the sun's disk, prominences appear as bright loops
  against the dark expanse of space.
The often unstable magnetism can then release such prominences as solar
  eruptions.
They poke out into the photosphere as loops, prominences, and those enigmatic
  signposts of solar activity-sunspots.
With a hydrogen alpha solar telescope, you can observe prominences and
  filaments in the chromosphere.
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