Definition of bioclast
: 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
Keep scrolling for more
Love words? Need even more definitions?Merriam-Webster unabridged
Words at Play
- Hot Enough for You? Words for the Summer Heat
- Where Does 'Run-of-the-Mill' Come From?
- The Provenance of 'Providence'
- The Good, The Bad, & The Semantically Imprecise - 8/16/19
Ask the Editors
- On Contractions of Multiple Words
- A Look at Uncommon Onomatopoeia
- Is Singular 'They' a Better Choice?
- Summer 2019 Words of the Day Quiz Take the quiz
- Obscure Shapes Take the quiz
- Name That Thing Take the quiz
- SCRABBLE® Sprint Play the game