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as·tron·o·my

astronomy

 
pronunciation:
stra n mi
features:
Word History, Word Explorer, Word Parts
part of speech: noun
definition: the branch of science that studies the universe beyond the earth.
Word History
The word astronomy comes from astronomos, an ancient Greek word that means "one who arranges the stars."
Word Explorer
See
  outer space, science, space
Word Parts  About this feature
The word astronomy contains the following parts:
astr, aster, astro Greek root that means star
synonyms:
stell
 
nom2, nomo, -nomy Greek root that means law, system of laws