from The American Heritage® Dictionary of the English Language, 4th 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The branch of astronomy which utilizes radio waves through the use of radio telescopes to study celestial bodies and occurrences.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the branch of astronomy that detects and studies the radio waves emitted by celestial bodies
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