| Environmental terminology | Definition |
|---|---|
| Dysoxic water | < 1 μM oxygen |
| Anoxic water | Not containing oxygen |
| Euxinic water | Anoxic, > 0.1 μM sulfide |
| Oxygen‐minimum zone (OMZ) | Open ocean water with < 20 μM oxygen |
| OMZ core, also known as ‘anoxic marine zone’ | Open ocean water with < 50 nM oxygen |
| Suboxic zone | < 1 μM oxygen, < 0.1 μM sulfide, in between oxic and euxinic zones of stratified waters |
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