Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology A fossil fragment used to date a rock stratum

Etymologies

Sorry, no etymologies found.

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Examples

  • Other less-common -clast words include mythoclast (someone who destroys myths), genuclast (a medical instrument for breaking knee-joint adhesions) and bioclast (a piece of shell or a fossil in a sedimentary rock).

    Week in Words Erin McKean 2012

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