: 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
ABC News, 28 Feb. 2026
An exfoliating serum that smooths the skin while also hydrating, its 10% concentration of lactic acid gently removes the dull outer layer of skin.
—Annie Blackman, Allure, 28 Feb. 2026
The lush formula is incredibly hydrating thanks to burdock oil, which is rich in fatty acids and vitamins.
—Reece Andavolgyi, InStyle, 27 Feb. 2026
For nighttime cleansing, Thosani suggests a hydrating serum with a facial lymphatic massage to help reduce puffiness and swelling.
—Pamela Brill, Parents, 27 Feb. 2026
See All Example Sentences for hydrate
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Verb
Electrolyte drinks and powders are meant to hydrate and replace the lost salt.
—ABC News, 28 Feb. 2026
An exfoliating serum that smooths the skin while also hydrating, its 10% concentration of lactic acid gently removes the dull outer layer of skin.
—Annie Blackman, Allure, 28 Feb. 2026
The lush formula is incredibly hydrating thanks to burdock oil, which is rich in fatty acids and vitamins.
—Reece Andavolgyi, InStyle, 27 Feb. 2026
For nighttime cleansing, Thosani suggests a hydrating serum with a facial lymphatic massage to help reduce puffiness and swelling.
—Pamela Brill, Parents, 27 Feb. 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 4 Mar. 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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