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semidiameter definition

semi·di·am·eter (-dī am′ət ər)

noun

  1. half a diameter; radius
  2. Astron. half the angular diameter of a celestial body with a visible disk, as the moon

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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