astronomy > define

noun

• The branch of physics that studies celestial bodies and the universe as a whole.
  • synonyms: uranology

• (n.) The science which treats of the celestial bodies, of their magnitudes, motions, distances, periods of revolution, eclipses, constitution, physical condition, and of the causes of their various phenomena.
• (n.) A treatise on or text-book of, the science.
• (n.) Astrology.