Breadcrumb Home > Dictionary > Index R Cite radar: Meaning and Definition of Find definitions for: ra•dar Pronunciation: (rā'där), [key] — n. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: radar (Thesaurus) rad radar astronomy TrendingHere are the facts and trivia that people are buzzing about. January 2021 Current Events: US News Noble Titles and Ranks in a Monarchy Chinese New Year History, Meaning, and Celebrations The Manchu Keeping Your Brain Active in a COVID-19 World Inaugural Trivia Related Content Daily Word Quiz: evanescent Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language