: 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
Brigitt Earley, Glamour, 16 June 2025
This creamy, long-wearing formula hydrates, brightens, and soothes.
—Kristen Philipkoski, Forbes.com, 29 May 2025
Lindsay Curtis, Health, 25 June 2025
These tapes and patches likely affect wrinkles by trapping moisture, which hydrates the skin.
—Brendan Camp, Verywell Health, 25 June 2025
See All Example Sentences for hydrate
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Noun
Our testers praised the creamy—but not at all sticky—texture that glides on easily and hydrates without feeling heavy.
—Brigitt Earley, Glamour, 16 June 2025
This creamy, long-wearing formula hydrates, brightens, and soothes.
—Kristen Philipkoski, Forbes.com, 29 May 2025
Verb
Skin health: Castor oil is a natural moisturizer that can help soften and hydrate the skin.
—Lindsay Curtis, Health, 25 June 2025
These tapes and patches likely affect wrinkles by trapping moisture, which hydrates the skin.
—Brendan Camp, Verywell Health, 25 June 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 8 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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