noun bi·o·strome \ˈbīəˌstrōm\

Definition of biostrome



  1. :  a distinctly bedded or broadly lenticular body of rock composed mainly of the remains of sedentary organisms (such as shell beds, crinoid beds, or coral beds) — compare bioherm

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.

Join MWU now and get access to America’s largest dictionary, with:

  • 300,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Origin and Etymology of biostrome

2bi- + Late Latin stroma coverlet, from Greek strōma bed, mattress

Seen and Heard

What made you want to look up biostrome? Please tell us where you read or heard it (including the quote, if possible).


a trip made at another's expense

Get Word of the Day daily email!