: 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
Charlotte Cho, Allure, 3 Jan. 2026
Combining their power with ginseng extract’s nourishing and hydrating properties creates a well-rounded product that will leave your skin feeling healthy.
—Gabriela Izquierdo, Southern Living, 2 Jan. 2026
Beneficial qualities There are many makeup remover cloths out there that have soothing, hydrating or exfoliating qualities.
—Bestreviews, Chicago Tribune, 1 Jan. 2026
Plus, it’s infused with hydrating ingredients like shea butter and castor oil, so lashes don’t feel crispy.
—Shalwah Evans, Glamour, 31 Dec. 2025
See All Example Sentences for hydrate
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Verb
The Intrigue of Exosomes Korea was once known as the gentle, hydrating approach to skin care, but those days are changing.
—Charlotte Cho, Allure, 3 Jan. 2026
Combining their power with ginseng extract’s nourishing and hydrating properties creates a well-rounded product that will leave your skin feeling healthy.
—Gabriela Izquierdo, Southern Living, 2 Jan. 2026
Beneficial qualities There are many makeup remover cloths out there that have soothing, hydrating or exfoliating qualities.
—Bestreviews, Chicago Tribune, 1 Jan. 2026
Plus, it’s infused with hydrating ingredients like shea butter and castor oil, so lashes don’t feel crispy.
—Shalwah Evans, Glamour, 31 Dec. 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 5 Jan. 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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