semidiameter[-dī am′ət ər]
semidiameter definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- half a diameter; radius
- Astron. half the angular diameter of a celestial body with a visible disk, as the moon
semidiameter definition by American Heritage Dictionary
The apparent radius of a celestial body when viewed as a disk from Earth.