: 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
Alanna Martine Kilkeary, Glamour, 5 Sep. 2025
Our team of experts spent four weeks putting 24 brands to the test — including Laneige, Fenty Beauty, Murad, and Tower28 — assessing them on texture, absorbency, cleansing and hydrating abilities, and overall results.
—Esme Benjamin, PEOPLE, 4 Sep. 2025
Taylor hydrates with a creamy leave-in like Cheribe’s Moisture Milk, while Hinkle refreshes the scalp using rosewater mists.
—Larry Stansbury, Essence, 4 Sep. 2025
Fresh fruit is naturally hydrating, portable, and nutrient-rich.
—Brittany Poulson, Verywell Health, 4 Sep. 2025
See All Example Sentences for hydrate
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Verb
While tubing mascaras offer some of the most popular no-clump formulas, other options rely on thin lash combs and hydrating ingredients to ensure that your makeup doesn’t crust up during application.
—Alanna Martine Kilkeary, Glamour, 5 Sep. 2025
Our team of experts spent four weeks putting 24 brands to the test — including Laneige, Fenty Beauty, Murad, and Tower28 — assessing them on texture, absorbency, cleansing and hydrating abilities, and overall results.
—Esme Benjamin, PEOPLE, 4 Sep. 2025
Taylor hydrates with a creamy leave-in like Cheribe’s Moisture Milk, while Hinkle refreshes the scalp using rosewater mists.
—Larry Stansbury, Essence, 4 Sep. 2025
Fresh fruit is naturally hydrating, portable, and nutrient-rich.
—Brittany Poulson, Verywell Health, 4 Sep. 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 9 Sep. 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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