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.

1870–75; < Greek klastós broken in pieces (klas- variant stem of klân to break + -tos verbal adjective suffix) + -ic

nonclastic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
clastic (ˈklæstɪk)
1.  (of sedimentary rock, etc) composed of fragments of pre-existing rock that have been transported some distance from their points of origin
2.  biology dividing into parts: a clastic cell
3.  able to be dismantled for study or observation: a clastic model of the brain
[C19: from Greek klastos shattered, from klan to break]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1875, from Gk. klastos "broken," from klan "to break," from PIE *kla-, var. of base *kel- "to strike."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
clast   (klāst)  Pronunciation Key 
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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Example sentences
The types of sediment found in a clastic sedimentary rock can tell geologists
  much about past environments.
Fine-grained clastic host rocks generally have low permeability.
Shale is a clastic sedimentary rock composed of silt and clay grains.
As a consequence, the coarse clastic units grow progressively thinner and finer
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