Astron.
a classification of stars of a given spectral type according to their luminosity, breaking them down into dwarfs, giants, and supergiants.
Astron.
a classification of stars of a given spectral type according to their luminosity, breaking them down into dwarfs, giants, and supergiants.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012