Webster's English Dictionary

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hydrate

1. hy.drate \'hi--.dra-t\ n 1: a compound or complex ion formed by the 
   union of water with some other s ubstance 2: HYDROXIDE {calcium ~} 
2. hydrate \hi--'dra--sh*n\ \'hi--.dra-t-*r\ vt : to cause to take up or 
   combine with water or the elements of water to b ecome a hydrate - 
   hy.dra.tion n