hydrate /haɪˈdɹeɪt/verb 3noun 2forms 3 verb3 •To take up, consume or become linked to water.A lotion can hydrate the skin. •(slang) To drink water. •To load data from a database record into an object's variables noun2 •A solid compound containing or linked to water molecules. •(rare) Water. formshydrated · hydrating · hydrates