Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of or relating to a main sequence.
  • adjective Of or relating to a star in hydrostatic equilibrium that is fueled by hydrogen fusion reactions in its core.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective astronomy Of or dealing with a major group of stars forming a band stretching from upper left to lower right on a Hertzsprung-Russell diagram when being plotted by luminosity and surface temperature

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