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Word of the Day Tuesday, June 9, 2026

clast

/klæst/ noun · British & US
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What does clast mean?

noun

A fragment of rock or mineral that has been broken off from a larger piece, or a fossil fragment. In geology, a clast is a piece of rock that has been broken off from a larger rock or boulder.

Example

"The geologist carefully examined the clast to determine its composition and origin."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for clast

Rhymes with clast

Etymologically related