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supergiant star

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noun
  1. Astronomy. an exceptionally luminous star whose diameter is more than 100 times that of the sun, as Betelgeuse or Antares.
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Origin of supergiant star

First recorded in 1925–30
Also called supergiant.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018