American Heritage® Dictionary of the English Language, Fourth Edition
- n. The branch of astronomy that deals with the origin and nature of emissions from extraterrestrial sources in the radio wave range of electromagnetic radiation rather than in the visible range.
- n. The branch of astronomy which utilizes radio waves through the use of radio telescopes to study celestial bodies and occurrences.
- n. the branch of astronomy that detects and studies the radio waves emitted by celestial bodies
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