: 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
Kaitlin Clapinski, InStyle, 11 Jan. 2026
From hydrating haircare products and TheraGun must-haves to cozy throw blankets and house slippers, keep scrolling to hear all about Palmer’s top winter essentials below.
—Averi Baudler, PEOPLE, 8 Jan. 2026
Ingredients like jojoba oil, which closely mimics the scalp’s natural sebum, as well as argan oil, sunflower seed oil, and rosemary, can help hydrate while supporting healthy blood circulation.
—Iman Balagam, Vogue, 8 Jan. 2026
Starting every morning with lemon water helps hydrate me after sleep and sets me up for my morning workout.
—Jamie Wolff, Health, 27 Dec. 2025
See All Example Sentences for hydrate
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Verb
Philosophy Hope in a Jar Moisturizer Oprah’s been using this hydrating cream for decades.
—Kaitlin Clapinski, InStyle, 11 Jan. 2026
From hydrating haircare products and TheraGun must-haves to cozy throw blankets and house slippers, keep scrolling to hear all about Palmer’s top winter essentials below.
—Averi Baudler, PEOPLE, 8 Jan. 2026
Ingredients like jojoba oil, which closely mimics the scalp’s natural sebum, as well as argan oil, sunflower seed oil, and rosemary, can help hydrate while supporting healthy blood circulation.
—Iman Balagam, Vogue, 8 Jan. 2026
Starting every morning with lemon water helps hydrate me after sleep and sets me up for my morning workout.
—Jamie Wolff, Health, 27 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 11 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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