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 descending
Oceanic

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

Oligotrophic

Low in nutrients. Compare to eutrophic

OMZ

Oxygen Minimum Zone.

Order

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

Organic

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

Organism

Any living entity.

Oxic

Containing oxygen. Compare to anoxic and hypoxic.

Oxidation

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

Oxidized

A substance that has undergone oxidation. Opposite of reduced.

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.