clast

[ klast ]
/ klæst /

noun

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.

Origin of clast

First recorded in 1950–55; probably back formation from clastic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for clast

clast

[ klăst ]

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

Related forms

clastic adjective (klăstĭk)
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