/ Dictionary / Index I infrared astronomy: Meaning and Definition of Find definitions for: in'frared' astron'omy Pronunciation: [key] the study of infrared radiation emitted by celestial objects. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. infrared infrared galaxy Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language