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

parsec

play
noun par·sec \ˈpär-ˌsek\

Definition of parsec

  1. :  a unit of measure for interstellar space that is equal to 3.26 light-years and is the distance to an object having a parallax of one second as seen from points separated by one astronomical unit



Origin and Etymology of parsec

parallax + second


First Known Use: 1913


Learn More about parsec


Seen and Heard

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

WORD OF THE DAY

of or relating to the heavens

Get Word of the Day daily email!