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1. Separable into parts or having removable sections: a clastic anatomical model.
2. Geology Made up of fragments of preexisting rock; fragmental.

[From Greek klastos, broken; see clast.]

clas′tic n.


1. (Geological Science) (of sedimentary rock, etc) composed of fragments of pre-existing rock that have been transported some distance from their points of origin
2. (Biology) biology dividing into parts: a clastic cell.
3. (Medicine) able to be dismantled for study or observation: a clastic model of the brain.
[C19: from Greek klastos shattered, from klan to break]


(ˈklæs tɪk)

1. composed of fragments or particles of older rocks or previously existing solid matter; fragmental.
2. pertaining to an anatomical model made up of detachable pieces.
3. Biol. breaking up into fragments or separate portions; dividing into parts.
[1870–75; < Greek klastós broken, v. adj. of klân to break + -ic]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.clastic - of or belonging to or being a rock composed of fragments of older rocks (e.g., conglomerates or sandstone)
geology - a science that deals with the history of the earth as recorded in rocks
disintegrative - tending to cause breakup into constituent elements or parts
2.clastic - capable of being taken apart; "the professor had a clastic model of the human brain"
detachable - designed to be unfastened or disconnected without damage; "shirts with detachable collars"
References in periodicals archive ?
The well, drilled in a water depth of 38 meters, encountered a major gas and condensates buildup in the pre-salt clastic geological sequence of lower Cretaceous age, crossing a hydrocarbon column of 240 meters.
Caofeidian 6-4-1 has set three records in the west of Bohai exploration area in achieving maximum cumulative thickness and maximum single pay thickness of oil pay zones, as well as highest test production in Paleogene clastic rocks.
a clastic sedimentary rock whose grains are predominantly
Until the early 1990s, little was known of the pre-Permian section but it was supposed that clastic sediments were better represented than they were in the younger section.
The Bras d'Or terrane is characterized by three main rock associations: metamorphic and igneous rocks, comprising gneiss formed at high metamorphic grade but relatively low pressure of metamorphism from pelitic to psammitic protoliths, and incorporating thin layers of marble and amphibolite; lower metamorphic grade dominantly clastic metasedimentary rocks, but also including minor calcareous and mafic components; and a suite of late Neoproterozoic calc-alkaline plutons and associated volcanic rocks (Raeside and Barr 1992).
Rather than cut materials himself, Andre ordered them precut, clastic, a word that derives from the Greek verb for "breaking off.
Clastic facies consists of marls, but most outcrops are erroded or covered by alluvium deposits in some areas.
Commenced drilling of the Koba-1 well, targeting Lower Liassic and Upper Triassic clastic reservoirs.
Atlas of Australian and New Zealand hydrocarbon seals; worldwide analogs for cap rocks and intraformational barriers in clastic depositional settings.
It has thus been concluded that Early Triassic deposits in the study area consisted of two parts: clastic (lower part) and carbonate (upper part), generally being equivalent to the Shotori Formation.
The well was drilled to explore the prospects of a Mesozoic Synrift Clastic reservoir lying over 2,000 metres below the already producing reservoirs in the Dhirubhai-1 and 3 (D1 and D3) gas fields.
Silver-gold-lead-zinc mineralization is hosted in a sequence of Permian marine clastic sediments and limestone which are overlain by a Jurassic terrestrial sedimentary sequence and underlain by Proterozoic metasedimentary rocks.