Glossary of Scuba Diving Terms (J)

Understanding That Strange Scuba Language

Welcome to our glossary of scuba diving terms. Diving, like many sports, has its own language. Our scuba glossary is for anyone interested in understanding the scuba diving definitions, scuba diving terms or scuba slang found in this strange scuba communication that divers use.

Our scuba glossary is easy to use. Just click on the letter that corresponds to the first letter of the word that you are looking for. All the words that begin with that letter will be displayed.

We will be constantly adding new terms to our scuba glossary. If you think we have missed a term or you can not find the scuba diving information you are looking for, please let us know. We will add it and the best definition we can find to our scuba glossary.

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J

See Buoyancy Compensator

Jellyfish are members of the cnidarians group of invertebrates. They are transparent and bell shaped with tentacles hanging down from their body. They are free-floating and seem serene, but in their tentacles there are stinging mechanisms that are used to catch prey and for defense.

A structure that extends into a body of water such as a sea, lake or river. This structure is normally made of rocks or concrete and is used to protect a harbor against a current or tide.

Contains a spring loaded shut-off valve that holds a diver's air supply open with tank pressure until the pressure in the tank drops to between 300-500 psi. This remaining air acts as a reserve and can be accessed by pulling a lever attached to the valve. This type of valve is not normally used in diving today.