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clast

[klast] /klæst/
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.
Origin of clast
1950-1955
1950-55; probably back formation from clastic
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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clast in Science
clast
  (klāst)   
A rock fragment or grain resulting from the breakdown of larger rocks.

clastic adjective (klās'tĭk)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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