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

clast

noun \ˈklast\

Definition of CLAST

:  a fragment of rock
ADVERTISEMENT

Origin of CLAST

Greek klastos broken, from klan to break; perhaps akin to Latin clades disaster
First Known Use: 1952

Rhymes with CLAST

bast, blast, cast, fast, gast, ghast, last, mast, Nast, past, vast

Learn More About CLAST

Browse

Next Word in the Dictionary: clasticPrevious Word in the Dictionary: classyAll Words Near: clast
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