/ Dictionary / Index H H-R diagram: Meaning and Definition of Find definitions for: H-R diagram Pronunciation: (āch'är'), [key] — Astron. Astron. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hradec Králové Hrdlička Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language