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.

Nearby words

  1. classon,
  2. classroom,
  3. classroom assistant,
  4. classwork,
  5. classy,
  6. clastic,
  7. clastogenic,
  8. clastothrix,
  9. clat,
  10. clathrate

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 formsclastic adjective (klăstĭk)

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.