Clast

//klæst// noun

noun ·Rare ·Advanced level

Definitions

Noun

1
a fragment of rock that was broken from a larger rock or rock unit.
2
(geology) a constituent fragment of a clastic rock wordnet

Etymology

Back-formation from clastic.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.