from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The branch of astronomy that studies bodies in the solar system by analyzing the reflections of radio waves sent from Earth.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A technique that uses radar echoes to examine bodies within the solar system, obtaining information about size, shape, topography, surface density, spin etc.
Sorry, no etymologies found.