Use the adjective submersible to describe something that can be used under water, like your fancy new submersible video camera.

If you can use your watch while you're scuba diving, it's submersible, and so is all of your diving gear. Anything that functions in the water can be described this way, including a submarine, which is sometimes actually called a submersible. The word comes from the Latin submergere, "to plunge under or sink," from the root words sub, "under," and mergere, "to plunge or immerse."

Definitions of submersible

adj capable of being immersed in water or functioning while submerged

“a submersible pump”
nonsubmergible, nonsubmersible
not submersible or submergible

n an apparatus intended for use under water

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bathyscape, bathyscaph, bathyscaphe
navigable deep diving vessel for underwater exploration
spherical deep diving apparatus (lowered by a cable) for underwater exploration
diving bell
diving apparatus for underwater work; has an open bottom and is supplied with compressed air
minisub, minisubmarine
submersible vessel for one or two persons; for naval operations or underwater exploration
Type of:
apparatus, setup
equipment designed to serve a specific function

n a warship designed to operate under water

submersible warship
surface ship
a warship that operates on the surface of the water
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U-boat, pigboat, sub, submarine
a submersible warship usually armed with torpedoes
attack submarine
a military submarine designed and armed to attack enemy shipping
auxiliary research submarine
a submarine for research purposes
fleet ballistic missile submarine
a submarine carrying ballistic missiles
nautilus, nuclear submarine, nuclear-powered submarine
a submarine that is propelled by nuclear power
Type of:
combat ship, war vessel, warship
a government ship that is available for waging war

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