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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