1. 
2. 
[syn: dried, dehydrated, desiccated]
The Collaborative International Dictionary of English v.0.48:
dehydrated \dehydrated\ adj.
   1. thoroughly dried out.
   Syn: desiccated, dried-out.
        [WordNet 1.5]
   2. suffering from fluid deprivation; as, to become deydrated
      from overexertion on a hot day.
      [WordNet 1.5]
WordNet (r) 3.0 (2006):
dehydrated
    adj 1: suffering from excessive loss of water from the body;
           "fever resulted from becoming dehydrated"; "was
           dehydrated after the marathon"
    2: preserved by removing natural moisture; "dried beef"; "dried
       fruit"; "dehydrated eggs"; "shredded and desiccated coconut
       meat" [syn: dried, dehydrated, desiccated]
Moby Thesaurus II by Grady Ward, 1.0:
22 Moby Thesaurus words for "dehydrated":
   adust, baked, burnt, corky, desiccated, dried, dried-up,
   evaporated, exsiccated, mummified, parched, scorched, sear, seared,
   sere, shriveled, sun-dried, sunbaked, weazened, wind-dried,
   withered, wizened