bioclast

noun

bio·​clast ˈbī-(ˌ)o-ˌklast How to pronounce bioclast (audio)
plural bioclasts
geology
: a fragment of biological origin (such as a shell fragment or fossil) occurring in sedimentary rock
You can have fabrics full of bioclasts—fragments of organic origin, such as bits of plants or clamshells—and you can classify the kinds of mineral grains, their size and distribution.Karen Chin, quoted in Discover, June 1996

Word History

First Known Use

1963, in the meaning defined above

Time Traveler
The first known use of bioclast was in 1963

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Dictionary Entries Near bioclast

Cite this Entry

“Bioclast.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bioclast. Accessed 13 Apr. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!