Definition of clastic in English:

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Pronunciation: /ˈklastɪk/


Denoting rocks composed of broken pieces of older rocks: a group of clastic sediments such as conglomerates
More example sentences
  • Mechanical deposition, by water or wind, produces clastic rocks composed of broken fragments, generally of silicate minerals and small pieces of rock: sandstones and conglomerates.
  • The Allouez Conglomerate is composed mainly of red-colored clastic rocks with lesser amounts of sandstone and siltstone.
  • In contrast, the Cambrian clastic rocks are characterized by a paucity of these zircons, suggesting a significant difference between Neoproterozoic and Cambrian drainage systems.


Late 19th century: from French clastique, from Greek klastos 'broken in pieces'.

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Line breaks: clas|tic

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