IPA: /ˌriːhaɪˈdreɪʃən/
KK: /riːhaɪˈdreɪʃən/
The process of restoring lost water and salts in the body after dehydration.
After a long run, rehydration is important to recover properly.
Rehydration → It is formed from "re-" (meaning again) and "hydration" (from Latin "hydrationem", meaning the process of causing to absorb water). The word "rehydration" means the process of restoring water to something that has lost it.
Think of 'again' ('re-') and 'water' ('hydration') to remember that rehydration means restoring water.