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WordReference Random House Unabridged Dictionary of American English © 2024bi•o•herm (bī′ō hûrm′),USA pronunciation n. [Geol.]- Geologya carbonate rock formation, in the form of an ancient reef or hummock, consisting of the fossilized remains of corals, algae, mollusks, and other sedentary marine life, and commonly surrounded by rock of a different lithology.
- Greek hérma sunken rock, reef
- bio- + -herm 1925–30
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