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clast

[ klast ]

noun

  1. a grain of sediment, silt, sand, gravel, etc., especially as a constituent fragment of a clastic rock formation, as distinguished from a chemical or biogenic component of such a formation.

clast

/ klăst /

  1. A rock fragment or grain resulting from the breakdown of larger rocks.

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Word History and Origins

Origin of clast1

First recorded in 1950–55; probably back formation from clastic

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