| n. | 1. | (Chem.) A compound formed by the union of water with some other substance, generally forming a neutral body, as certain crystallized salts. |
| v. t. | 1. | To form into a hydrate; to combine with water. |
| Noun | 1. | hydrate - any compound that contains water of crystallization |
| Verb | 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" |