Definitions for underwater
ˈʌn dərˈwɔ tər, -ˈwɒt ərun·der·wa·ter

Princeton's WordNet(2.33 / 3 votes)Rate this definition:

1. submerged, submersed, underwater(adj)

   beneath the surface of the water

   "submerged rocks"

2. subaqueous, subaquatic, submerged, submersed, underwater(adj)

   growing or remaining under water

   "viewing subaqueous fauna from a glass-bottomed boat"; "submerged leaves"

Wiktionary(2.00 / 1 vote)Rate this definition:

1. underwater(Noun)

   underlying water or body of water, for example in an aquifer or the deep ocean

2. underwater(Noun)

   A type of lure which lies beneath the water surface.

3. underwater(Verb)

   to water or irrigate insufficiently

4. underwater(Adjective)

   beneath the surface of the water, or of or pertaining to the region beneath the water surface

5. underwater(Adjective)

   beneath the water line of a vessel

6. underwater(Adjective)

   having negative equity; owing more on an asset than its market value

   We've been underwater on our mortgage ever since the housing crash.

Freebase(3.00 / 3 votes)Rate this definition:

1. Underwater

   Underwater is a term describing the realm below the surface of water where the water exists in a natural feature such as an ocean, sea, lake, pond, or river. Three quarters of the planet Earth is covered by water. A majority of the planet's solid surface is abyssal plain, at depths between 4,000 and 5,500 metres below the surface of the oceans. The solid surface location on the planet closest to the centre of the orb is the Challenger Deep, located in the Mariana Trench at a depth of 10,924 metres. Although a number of human activities are conducted underwater—such as research, scuba diving for work or recreation, or even underwater warfare with submarines, this very extensive environment on planet Earth is hostile to humans in many ways and therefore little explored. But it can be explored by sonar, or more directly via manned or autonomous submersibles. The ocean floors have been surveyed via sonar to at least a coarse resolution; particularly-strategic areas have been mapped in detail, in the name of detecting enemy submarines, or aiding friendly ones, though the resulting maps may still be classified. An immediate obstacle to human activity under water is the fact that human lungs cannot naturally function in this environment. Unlike the gills of fish, human lungs are adapted to the exchange of gases at atmospheric pressure, not liquids. Aside from simply having insufficient musculature to rapidly move water in and out of the lungs, a more significant problem for all air-breathing animals, such as mammals and birds, is that water contains so little dissolved oxygen compared with atmospheric air. Air is around 21% O2; water typically is less than 0.001% dissolved oxygen.

Suggested Resources(2.50 / 2 votes)Rate this definition:

1. underwater

   Song lyrics by underwater -- Explore a large variety of song lyrics performed by underwater on the Lyrics.com website.

How to pronounce underwater?

1. 

   Alex

   US English

   

   Daniel

   British

   

   Karen

   Australian

   

   Veena

   Indian

How to say underwater in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of underwater in Chaldean Numerology is: 4

2. Pythagorean Numerology

   The numerical value of underwater in Pythagorean Numerology is: 3

Examples of underwater in a Sentence

1. Luca Zaia:

   Despite 5 billion euros underwater, St. Marks Square certainly wouldnt be secure.

2. Marc Feldman:

   There aren't enough people who spend so much time underwater to make a really definitive statistical statement.

3. Eric Wolfe:

   [I] had eyes on him the whole time and relayed his position to dispatch, and he went underwater and didn’t come up.

4. Lindsay Porter:

   When you increase that underwater noise, you not only stop dolphins from being able to forage ... we also stop them communicating with each other.

5. Mark Moline:

   We've entered a new age of exploration, new sensors and improved underwater robots that can bring back real-time images are driving new discoveries.

Images & Illustrations of underwater

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