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Aqua-Lung trademark for an underwater breathing device.
fin a rubber flipper worn on the feet by an underwater swimmer. [1/3 definitions]
flipper one of a pair of flat, rubber shoes shaped like a frog's foot and used for swimming or underwater diving. [1/2 definitions]
frogman a swimmer who works underwater.
Jacuzzi trademark for a type of bath that has underwater jets. The jets shoot air into the water, making it whirl around.
polyp a small water animal with a soft body and a mouth surrounded by tentacles. Polyps attach themselves to rocks or other underwater objects. Corals, sea anemones, and jellyfish spend part of their lives as polyps and part of their lives floating freely.
scuba diving the act of swimming underwater while wearing special breathing equipment.
sea anemone a small sea animal with many tentacles. It looks like a flower. Sea anemones are related to jellyfish, but unlike jellyfish they spend their entire lives attached to underwater objects.
skin diving swimming in which the swimmer uses flippers, a face mask, and an air tank to swim underwater quickly and easily.
sonar a way to find objects underwater by sending and reflecting sound waves. (The word is formed from "sound navigation and ranging.") [1/2 definitions]
submerge to put underwater or in some other liquid. [1/3 definitions]
tunnel an underground or underwater passage used by cars, trains, or other vehicles. [1/4 definitions]
undersea having to do with, located, carried on, or used beneath the surface of the sea; underwater.