: a compound formed by the union of water with some other substance
hydrated; hydrating
1
: to cause to take up or combine with water or the elements of water
2
: to supply with ample fluid or moisture
hydrates and softens the skin
: to become a hydrate
Examples of hydrate in a Sentence
Verb
lotions and creams that hydrate the skin
Drink fluids to hydrate the body.
Recent Examples on the Web
Reece Andavolgyi, InStyle, 12 Apr. 2026
Moisturizers, treatments, a hydrating kit and more.
—ABC News, 11 Apr. 2026
Amid hot temperatures, forecasters said to hydrate, limit time outdoors, rest in the shade and never leave children or pets in the car.
—Eduardo Cuevas, USA Today, 11 Apr. 2026
This unique hair dryer draws moisture in from the surrounding air to generate super fine nanoparticles that penetrate your hair to hydrate.
—Bestreviews, Mercury News, 10 Apr. 2026
See All Example Sentences for hydrate
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Verb
Fable and Mane HoliRoots Pre-Wash Treatment Oil The heavy hitters in this hydrating formula include ashwagandha to strengthen the roots, amla to add shine, and castor oil to condition.
—Reece Andavolgyi, InStyle, 12 Apr. 2026
Moisturizers, treatments, a hydrating kit and more.
—ABC News, 11 Apr. 2026
Amid hot temperatures, forecasters said to hydrate, limit time outdoors, rest in the shade and never leave children or pets in the car.
—Eduardo Cuevas, USA Today, 11 Apr. 2026
This unique hair dryer draws moisture in from the surrounding air to generate super fine nanoparticles that penetrate your hair to hydrate.
—Bestreviews, Mercury News, 10 Apr. 2026
See All Example Sentences for hydrate
Cite this Entry
“Hydrate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrate. Accessed 15 Apr. 2026.
Copy CitationKids Definition
hydrate
1 of 2 noun
hy·drate
ˈhī-ˌdrāt 
: a compound formed by the union of water with some other substance
a hydrate of copper sulfate
hydrate
2 of 2 verb
hydrated; hydrating
1
: to cause to take up or combine with water or the elements of water
2
: to supply with sufficient amounts of fluid or moisture
Medical Definition
hydrate
1 of 2 noun
hy·drate
ˈhī-ˌdrāt
: a compound (as Glauber's salt) formed by the union of water with some other substance
hydrate
2 of 2 verb
hydrated; hydrating
: to cause to take up or combine with water or the elements of water
: to become a hydrate
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