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clast

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WordReference Random House Unabridged Dictionary of American English © 2026

clast n.

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

probably back formation from clastic 1950–55

'clast' also found in these entries (note: many are not synonyms or translations):

biblioclast - mythoclast - osteoclast

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