Definition of clast in English:

clast

Syllabification: clast
Pronunciation: /klast
 
/

noun

Geology
A constituent fragment of a clastic rock.
More example sentences
  • The clasts in volcaniclastic rocks may range from fine ash to bombs and enormous blocks.
  • This is substantiated by the presence of eroded Permian carbonate clasts.
  • The siltstones contain poorly sorted angular fragments of quartz, and angular clasts and cleavage fragments of plagioclase and alkali feldspar.

Origin

mid 20th century: back-formation from clastic.

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Word of the day grammarian
Pronunciation: grəˈme(ə)rēən
noun
a person who studies and writes about grammar