dehydration
US /ˌdiː.haɪˈdreɪ.ʃən/
UK /ˌdiː.haɪˈdreɪ.ʃən/

1.
a harmful reduction in the amount of water in the body
:
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Symptoms of dehydration include thirst, dry mouth, and fatigue.
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Drinking enough water is crucial to prevent dehydration.
2.
the process of removing water from something
:
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Food dehydration is a common method of preservation.
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The machine uses heat for efficient dehydration of fruits.