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Dive Adventures Scuba Glossary is for scuba divers and anyone else interested in scuba diving terminology. To find the scuba glossary term that you are looking for click on the letters below to display the scuba glossary terms that begin with that letter. If you feel that we have missed a term from our scuba glossary or would like a term added to our scuba glossary please contact us so that we can add that term to our scuba glossary. Dive Adventures thanks you for visiting our scuba glossary and helping us to make it better for other scuba divers and those interested in scuba diving terminology Optionally you may select "All Terms" to display the entire list of terms from our scuba glossary database.
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Narcosis
Depressed mental state, anywhere from confusion or drowsiness to coma.
NAUI
National Associatio of Underwater Instructors. It is one of the oldest certifying agencies.
Nautical Mile
Also known as a "geographical mile" or "sea mile"; a unit of distance designed to equal approximately 1 minute of arc of latitude, 6080.20 ft.; approximately 1.15 times as long as the statute mile of 5280 ft.
Nematocyst,
minute, elongated, or spherical capsule produced exclusively by members of the phylum Cnidaria (e.g., jellyfish, corals, sea anemones). Several such capsules occur on the body surface. Each is produced by a special cell called a cnidoblast and contains a coiled, hollow, usually barbed thread, which quickly turns outward (i.e., is everted) from the capsule upon proper stimulation. The purpose of the thread, which often contains poison, is to ward off enemies or to capture prey.
Neritic zone
From the low-tide line to the to the edge of the continental shelf - around 200 m. After the neritic zone comes the pelagic zone - or open ocean.
Nitrogen
Inert gas that makes up 79% of air. Nitrogen is inert in that it does not enter into any chemical reation in the body, but it can cause problems under pressure (see nitrogen narcosis, decompression sickness).
Nitrogen Narcosis
Depressed mental state from high nitrogen pressure; usually does not begin to manifest on compressed air until below 80 fsw.
Nitrox
Any mixture of nitrogen and oxygen that contains less than the 79% nitrogen as found in ordinary air.
NOAA
Abbreviation for the National Oceanic and Atmospheric Association.
Nocturnal
refers to events that occur at night. From the Late Latin word nocturnālis, dating back to 147585

There are 10 scuba glossary terms listed.

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