H2O
noun
: water sense 1a
American lawns and gardens drink up H2O at alarming rates, especially in the dry West, where more than 50% of residential water is used for landscaping.—
Bryan Walsh
Bryan WalshExamples of H2O in a Sentence
Recent Examples on the Web
The higher its gold content, the better a watch can stand up to corrosion when exposed to H2O (leather bands, though, are a no-no for chlorine or salty water).
—Stacia Datskovska, Footwear News, 27 May 2026
An ancient and unusual object Water, or H2O, typically contains two hydrogen atoms and one oxygen atom.
—Ashley Strickland, CNN Money, 1 May 2026
Ur Rehman argues that still not enough has been done to invest in solutions to create a sustainable supply of H2O as humans continue to guzzle up the resource.
—Sasha Rogelberg, Fortune, 23 Apr. 2026
In addition to waking up your nervous system and digestion, starting with a big glass of H2O sets you up for a more hydrated day.
—Kate Donovan, Martha Stewart, 8 Apr. 2026
Each week features a unique theme — from The Circus Comes to Town and Out of this World to H2O Olympics and Holiday Hoedown — while core camp traditions stay consistent to help campers build confidence, friendships and life skills.
—Post-Tribune, Chicago Tribune, 16 Mar. 2026
Last but not least, don’t underestimate the importance of sipping on good old H2O throughout the day.
—Michele Ross, SELF, 3 Mar. 2026
In every variety of ice, H2O molecules interact, with weak connections called hydrogen bonds forming between one oxygen and one hydrogen atom in separate molecules.
—Meghan Bartels, Scientific American, 23 Jan. 2026
For simple hydration, H2O of all kinds works A-OK.
—Karla Walsh, Better Homes & Gardens, 16 Jan. 2026
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Stacia Datskovska, Footwear News, 27 May 2026
An ancient and unusual object Water, or H2O, typically contains two hydrogen atoms and one oxygen atom.
—Ashley Strickland, CNN Money, 1 May 2026
Ur Rehman argues that still not enough has been done to invest in solutions to create a sustainable supply of H2O as humans continue to guzzle up the resource.
—Sasha Rogelberg, Fortune, 23 Apr. 2026
In addition to waking up your nervous system and digestion, starting with a big glass of H2O sets you up for a more hydrated day.
—Kate Donovan, Martha Stewart, 8 Apr. 2026
Each week features a unique theme — from The Circus Comes to Town and Out of this World to H2O Olympics and Holiday Hoedown — while core camp traditions stay consistent to help campers build confidence, friendships and life skills.
—Post-Tribune, Chicago Tribune, 16 Mar. 2026
Last but not least, don’t underestimate the importance of sipping on good old H2O throughout the day.
—Michele Ross, SELF, 3 Mar. 2026
In every variety of ice, H2O molecules interact, with weak connections called hydrogen bonds forming between one oxygen and one hydrogen atom in separate molecules.
—Meghan Bartels, Scientific American, 23 Jan. 2026
For simple hydration, H2O of all kinds works A-OK.
—Karla Walsh, Better Homes & Gardens, 16 Jan. 2026
Cite this Entry
“H2O.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/H2O. Accessed 28 May. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
