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biohazard

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WordReference Random House Unabridged Dictionary of American English © 2026

bi•o•haz•ard n.

Ecologya pathogen, esp. one used in or produced by biological research.
Ecologythe health risk posed by the possible release of such a pathogen into the environment.

bio- + hazard

bi′o•haz′ard•ous, adj.

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