WordReference Random House Unabridged Dictionary of American English © 2025
bi•o•strome
(bī′ə strōm′),USA pronunciation n. [Geol.]
bi′o•stro′mal, adj.
- Geologya bedded, blanketlike sedimentary deposit of organic origin built by marine organisms and including shell beds, flat reefs, and corals.
- 1930–35; bio- + Greek strôma layer, bed; see stroma