 Euxinia

Anoxic, sulfide-bearing conditions in a water body. Euxinia combines oxygen absence with dissolved sulfide, potentially adding toxicity to the habitat loss caused by ocean anoxia. It is a chemical state rather than a synonym for every low-oxygen environment.

Euxinia is a term that historically refers to the Black Sea and its surrounding region. The name derives from the ancient Greek word "Euxeinos," which translates to " hospitable" or "welcoming." This designation was somewhat ironic, as the Black Sea was known for its treacherous waters and inhospitable conditions for navigation and settlement at times.