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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

clastic

Adjective

clas=tic

WORDNET DICTIONARY

clastic(s = adj.all) Array - of or belonging to or being a rock composed of fragments of older rocks (e.g., conglomerates or sandstone); Array

Derived forms noun clast₁, noun clastic rock₁

clastic(s = adj.all) Array - capable of being taken apart; "the professor had a clastic model of the human brain"

clastic, a. [Gr. br, fr. to break.].

Pertaining to what may be taken apart; as, clastic anatomy (of models). [1913 Webster]
Fragmental; made up of brokas, sandstone is a clastic rock. [1913 Webster]

clastic, adj. Geol. composed of broken pieces of older rocks.

Idiom

clastic rocks conglomerates, sandstones, etc.

Etymology

F clastique f. Gk klastos broken in pieces

For further exploring for "clastic" in Webster Dictionary Online