To cause (something dehydrated) to take up fluid. (verb-transitive)
To replenish the body fluids of. (verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "rehydrate" in a sentence
"The spa itself is top notch, with the wide array of treatments that you'd expect, including several designed to rehydrate, which is an absolute must in the desert environment."