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[klas-tik] /ˈklæs tɪk/
Biology. breaking up into fragments or separate portions; dividing into parts.
pertaining to an anatomical model made up of detachable pieces.
Geology. noting or pertaining to rock or rocks composed of fragments or particles of older rocks or previously existing solid matter; fragmental.
Origin of clastic
1870-75; < Greek klastós broken in pieces (klas- variant stem of klân to break + -tos verbal adjective suffix) + -ic
Related forms
nonclastic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for clastic


(of sedimentary rock, etc) composed of fragments of pre-existing rock that have been transported some distance from their points of origin
(biology) dividing into parts: a clastic cell
able to be dismantled for study or observation: a clastic model of the brain
Word Origin
C19: from Greek klastos shattered, from klan to break
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for clastic

"consisting of broken pieces," 1875, in geology, from Latinized form of Greek klastos "broken in pieces," from klan, klaein "to break," from PIE *kla-, variant of root *kel- "to strike."

Online Etymology Dictionary, © 2010 Douglas Harper
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clastic in Medicine

clastic clas·tic (klās'tĭk)

  1. Breaking up into pieces or exhibiting a tendency to break or divide.

  2. Separable into parts or having removable sections, as an anatomical model.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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clastic in Science
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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