rehydrate

verb

re·​hy·​drate (ˌ)rē-ˈhī-ˌdrāt 

rehydrated; rehydrating; rehydrates

transitive verb

: to restore fluid to (something dehydrated)

rehydratable

(ˌ)rē-ˈhī-ˌdrā-tə-bəl 

adjective

rehydration

ˌrē-ˌhī-ˈdrā-shən 

noun

Examples of rehydrate in a Sentence

Recent Examples on the Web

Less than 12 hours after weighing in a pound below the 147lb limit at the official weigh-in on Friday, Benn posted a video showing his weight having shot up to 178lb after rehydrating and refuelling. — Sarah Shephard, New York Times, 14 Sep. 2026

Alongside those exfoliators are ingredients like a special prebiotic that’s been clinically shown to boost hydration and reduce sebum, as well as botanical extracts and humectants to soothe and rehydrate. — Brigitt Earley, Glamour, 14 Sep. 2026

Start with Hydration Begin your meal by sipping some water to rehydrate. — Helen Carefoot, Flow Space, 14 Sep. 2026

But symptoms persisted, and Obelix was put into neonatal intensive care and rehydrated at just 2 weeks old. — Laura Sharman, CNN Money, 9 Sep. 2026

Word History

First Known Use

1945, in the meaning defined above

Rhymes for rehydrate

• dehydrate

Kids Definition

rehydrate

verb

re·​hy·​drate (ˈ)rē-ˈhī-ˌdrāt 

: to restore fluid to (something dehydrated)

rehydration

ˌrē-ˌhī-ˈdrā-shən 

noun

Medical Definition

rehydrate

transitive verb

re·​hy·​drate (ˈ)rē-ˈhī-ˌdrāt 

rehydrated; rehydrating

: to restore fluid to (something dehydrated)

especially : to restore body fluid lost in dehydration to

rehydrate a patient

rehydration

ˌrē-ˌhī-ˈdrā-shən 

noun