Origin of rehydrate

1920–25; re- + hydrate, on the model of dehydrate
Related formsre·hy·dra·tion, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for rehydrate

1923, from re- + hydrate (v.). Related: Rehydrated; rehydrating.

Online Etymology Dictionary, © 2010 Douglas Harper

rehydrate in Medicine


  1. To cause rehydration of something.
  2. To replenish the body fluids of an individual.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.