underwater
adjective
un·der·wa·ter
ˌən-dər-ˈwȯ-tər 
-ˈwä-
1
: lying, growing, worn, performed, or operating below the surface of the water
underwater plants
2
: being below the waterline of a ship
3
a
: having, relating to, or being a mortgage loan for which more is owed than the property securing the loan is worth
homeowners who are underwater on their loans
b
: having, relating to, or being a stock option for which the price of the option is higher than the current market value of the stock
underwater
adverb
Examples of underwater in a Sentence
underwater plants don't require as much light to grow as surface plants
a vessel designed for underwater exploration
Recent Examples on the Web
By measuring noise via the underwater seismometer networks, the researchers were able to detect strain accumulating in the northern part of the Cascadia Subduction Zone.
—
Julia Jacobo, ABC News, 14 May 2026
The current limitation involve the underwater endurance of these UUVs which is directly linked to energy density of the onboard energy storage systems.
—Prabhat Ranjan Mishra, Interesting Engineering, 14 May 2026
Scientists have discovered something about suckerfish that might make their underwater companions want to hide.
—James Powel, USA Today, 14 May 2026
Popular among scuba divers and cliff jumpers, the swimming hole is open year-round, giving you a chance to explore its underwater corridors in any season.
—Talia Avakian, Travel + Leisure, 14 May 2026
See All Example Sentences for underwater
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Julia Jacobo, ABC News, 14 May 2026
The current limitation involve the underwater endurance of these UUVs which is directly linked to energy density of the onboard energy storage systems.
—Prabhat Ranjan Mishra, Interesting Engineering, 14 May 2026
Scientists have discovered something about suckerfish that might make their underwater companions want to hide.
—James Powel, USA Today, 14 May 2026
Popular among scuba divers and cliff jumpers, the swimming hole is open year-round, giving you a chance to explore its underwater corridors in any season.
—Talia Avakian, Travel + Leisure, 14 May 2026
See All Example Sentences for underwater
Cite this Entry
“Underwater.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underwater. Accessed 20 May. 2026.
Copy CitationKids Definition
underwater
adjective
un·der·wa·ter
ˈən-dər-ˈwȯt-ər
-ˈwät-
: lying, growing, worn, performed, or operating below the surface of the water
underwater plants
an underwater cave
underwater
adverb
-ˈwȯt-,
-ˈwät-
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