Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

astronomy

play
noun as·tron·o·my \ə-ˈsträ-nə-mē\

Simple Definition of astronomy

  • : the scientific study of stars, planets, and other objects in outer space

Full Definition of astronomy

plural as·tron·o·mies

  1. :  the study of objects and matter outside the earth's atmosphere and of their physical and chemical properties

Origin of astronomy

Middle English astronomie, from Anglo-French, from Latin astronomia, from Greek, from astr- + -nomia -nomy


First Known Use: 13th century



Seen and Heard

What made you want to look up astronomy? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 9, 2016

marked by high spirits and laughter

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

spindrift duvet kittly-benders pince-nez
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ