1. (

• hydrate ,

) supply water or liquid to in order to maintain a healthy balance; "the bicyclists must be hydrated frequently" ;

2. (

• hydrate ,

) become hydrated and combine with water ;

3. (

• hydrate

) cause to be hydrated; add water or moisture to; "hydrate your skin" ;

1. (

• hydrous ,
• hydrated

) containing combined water (especially water of crystallization as in a hydrate) ;