Dictionary
Thesaurus
Medical
Scrabble®
Spanish Central
Browse DictionaryBrowse Thesaurus
Get our free apps!iPhone•iPad•Android
Games
Word of the Day
Video
Blog: Words at Play
My Faves
Dictionary

megaparsec

noun mega·par·sec \ˌme-gə-ˈpär-ˌsek\

Definition of MEGAPARSEC

:  a unit of measure for distances in intergalactic space equal to one million parsecs
ADVERTISEMENT

Origin of MEGAPARSEC

International Scientific Vocabulary
First Known Use: 1920

Rhymes with MEGAPARSEC

breathe down one's neck, cinematheque, kiloparsec, Melchizedek, mock turtleneck, promenade deck, traveler's check, winter crookneck

Learn More About MEGAPARSEC

Browse

Next Word in the Dictionary: megaphone (noun)Previous Word in the Dictionary: megamergerAll Words Near: megaparsec
ADVERTISEMENT
10 Charming Words for Nasty People
Put-downs with flair
Learn More
When "Literally" isn't, well, literal
How to use a word that (literally) drives some people nuts.
Watch Now
Know what this is?
Test your vocab with our fun, fast game
Go Play
Fear of cats?
Ailurophobia, and 9 other unusual fears
Learn More
Join Us
Merriam-Webster
on Facebook
Merriam-Webster
on Twitter
Bookstore: Digital and Print
Merriam-Webster references for Mobile, Kindle, print, and more.
See All
Other Merriam-Webster Dictionaries