: 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
Parker Hall, Wired News, 11 July 2025
The Crown Affair Leave-In Conditioner hydrates dry strands, adds shine, and defines texture without ever feeling greasy or heavy.
—Jailynn Taylor, Allure, 7 July 2025
Deirdre Bardolf, FOXNews.com, 21 July 2025
Even in the cooler temperatures, try to stay in the shade and keep your dog hydrated.
—Rachel McRady, People.com, 16 July 2025
See All Example Sentences for hydrate
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Noun
Photograph: Amazon Cosrx Advanced Snail Mucin 96 Percent Power Repairing Essence Serum
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Cosrx's Snail 96 Mucin Essence—with 96 percent snail secretion—hydrates and repairs skin, fragrance-free.
—Parker Hall, Wired News, 11 July 2025
The Crown Affair Leave-In Conditioner hydrates dry strands, adds shine, and defines texture without ever feeling greasy or heavy.
—Jailynn Taylor, Allure, 7 July 2025
Verb
Watermelon and cantaloupe top the charts for highest water content, but peaches follow closely behind, according to the USDA.
Fruits that hydrate while also providing electrolytes can help the body better replace and retain fluids than water alone, research shows.
—Deirdre Bardolf, FOXNews.com, 21 July 2025
Even in the cooler temperatures, try to stay in the shade and keep your dog hydrated.
—Rachel McRady, People.com, 16 July 2025
See All Example Sentences for hydrate
Cite this Entry
“Hydrate.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrate. Accessed 28 Jul. 2025.
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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