GNU Collaborative International Dictionary of English

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Found one definition

1.       
   dehydrated adj.
   1. thoroughly dried out.
   
   Syn. -- desiccated, dried-out.
   
   [WordNet 1.5]
   
   
   2. suffering from fluid deprivation; as, “to become dehydrated from overexertion on a hot day”.
   
   [WordNet 1.5]