a massive, relatively hot, blue to white star, as Rigel or Spica, having a surface temperature between 10,000 and 30,000 K and with an absorption spectrum dominated by the Balmer series of hydrogen with lines of neutral helium present.
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Compare spectral type.
Words nearby B star
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020