Supergiant

adj. especially bright star whose diameter is 100 times larger than that of the sun (Astronomy)

Supergiants are among the most massive stars. In the Hertzsprung-Russell diagram they occupy the top region of the diagram. In the Yerkes spectral classification supergiants are class Ia (most luminous supergiants) or Ib (less luminous supergiants). They typically have bolometric absolute magnitudes between -5 and -12. The most luminous supergiants are often classified as hypergiants of class 0.
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Noun
1. an extremely bright star of very large diameter and low density
(hypernym) star
(hyponym) Betelgeuse, Alpha Orionis

A star with a higher luminosity and a larger radius than a giant of the same spectral classification. It will have typically one hundred times the luminosity of a giant. It will almost certainly become a supernova.

supergiant
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