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astronomy definition

as·trono·my (ə strän′ə mē)

noun

  1. the science of the universe in which the stars, planets, etc. are studied, including their origins, evolution, composition, motions, relative positions, sizes, etc.
  2. pl. astronomies -·mies a book or treatise on this

Etymology: ME & OFr astronomie < L astronomia < Gr < astron, star + nomos, law: see -nomy

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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