[1] : The Collaborative International Dictionary of English v.0.48

protuberance \protu"berance\, n. cf. f. protub'erance. see
   protuberant.
   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.
   1913 webster

   solar protuberances astron., 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.
      1913 webster

   syn: projection, protuberance. protuberance differs from
        projection, being applied to parts that rise from the
        surface with a gradual ascent or small angle; whereas a
        projection may be at a right angle with the surface.
        1913 webster
see also:
protuberant solar protuberances solar prominences projection protuberance 

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