Scientific Glossary

Glossary of terms and abbreviations relevant to the International Seabed Authority and the documents it produces

Please note that this is a constantly evolving document.

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Titlesort ascending
Oxygen Minimum Zone

A water layer present in all oceans at depths between 400 and 1,000m, caused by the sinking and degrading by bacteria of organicmatter produced in the surface ocean. The oxygen scarcity can cause particulate metals to dissolve. Often abbreviated to OMZ.

Oxidized

A substance that has undergone oxidation. Opposite of reduced.

Oxidation

Chemical transformation of a substance by combining it with oxygen or through the loss of hydrogen or electrons. Opposite ofreduction.

Oxic

Containing oxygen. Compare to anoxic and hypoxic.

Organism

Any living entity.

Organic

Pertaining to, or derived from, biological material. Opposite of inorganic.

Order

An intermediate level of taxonomic classification containing one or more Families forming a subgroup of a Class.

OMZ

Oxygen Minimum Zone.

Oligotrophic

Low in nutrients. Compare to eutrophic

Oceanic

Pertaining to the water column seaward of the shelf break. Compare to neritic.