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Meaning of Hertzsprung-Russell diagram

Hertz'sprung-Rus'sell di"agram

Pronunciation: (hârt'sproong-rus'ul), [key]
— Astron. Astron.
  1. the graph showing the absolute magnitude plotted against the surface temperature for a group of stars. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.