Definition of dehydrate in US English:



[with object]often as adjective dehydrated
  • 1Cause (a person or a person's body) to lose a large amount of water.

    ‘his body temperature was high and he had become dehydrated’
    • ‘The rumor that coffee dehydrates people lacks scientific support.’
    • ‘My best friend passed out on the dance floor and that was the only way she was able to get a glass of water, when she was totally dehydrated.’
    • ‘If your child is dehydrated, it is important to replace lost body fluids right away.’
    • ‘When you're dehydrated, your skin is one of the first organs to show it.’
    • ‘If you're dehydrated, your body may not recover as quickly after a workout (leaving you sore longer).’
    • ‘He was dehydrated, his throat was swelling, and he had lost blood.’
    • ‘Yes, if the athlete is dehydrated, any water will accomplish that, dumbo!’
    • ‘There were people being sick and confined to their rooms and lots of people were dehydrated.’
    • ‘The fact that it was so warm caught a lot of people out and I was dehydrated rather than anything else.’
    • ‘If you are dehydrated, the test will overestimate your body fat by as much as 3 percentage points.’
    • ‘Have a glass of water with your meals instead of caffeinated drinks like soda and coffee, which dehydrate the body.’
    • ‘You know that you can't live long without water, but how do you know if you're dehydrated?’
    • ‘The doctor suggested she lie on her side and drink two large glasses of water to make sure she wasn't dehydrated.’
    • ‘Use composite dressings cautiously if the patient is dehydrated or has fragile skin.’
    • ‘Coffee can also dehydrate you, so counter its effects by drinking water.’
    • ‘The more water you drink, the less dehydrated you will become, and the less severe your hangover will be.’
    • ‘75 percent of Americans are chronically dehydrated - mainly because your body is low on water long before your thirst response alerts you.’
    • ‘I'm dehydrated, but I can't stand the thought of water.’
    • ‘Thus, when a person is dehydrated by more than 2% of body weight, both heart rate and body temperature are elevated during exercise.’
    • ‘Many athletes and the general norm of people are dehydrated without being aware they are.’
    dry up, dry out, lose water, become dry
    View synonyms
    1. 1.1no object Lose a large amount of water from the body.
      • ‘When my body can dehydrate and lose its water just like the land drying up.’
      • ‘If these minerals are heated, they will dehydrate and lose their water of hydration.’
      • ‘The w profiles in the plant were affected by these soil w, becoming more negative as the soil dehydrated, but recovering when water was resupplied.’
    2. 1.2 Remove water from (food) in order to preserve and store it.
      ‘dehydrated mashed potatoes’
      • ‘It is susceptible to noble rot or Botrytis (the fungus that attacks certain ripe grapes and dehydrates them so that they give wines of immense richness and sweetness).’
      • ‘At the far extreme of technology, meat is dehydrated by freeze-drying to provide lightweight military rations.’
      • ‘He then used a vacuuming process to dehydrate this softened grain, leaving behind a thick, sweet goo.’
      • ‘Well, usually when you take the skin off it can be preserved in a number of different ways and very often it's salted and that dehydrates it to preserve it and stop bacteria decomposing it.’
      • ‘The reason behind this is that salt effectively dehydrates the polymer by disruption of hydrogen bonding with water, similar to the effect of increasing temperatures.’
      • ‘One division of my business harvests and dehydrates fruits and vegetables for use in papermaking formulas.’
      • ‘Making pasta from zucchini or dehydrating fruits is time-consuming, and many raw meals can take days to prepare.’
      • ‘These sulfur-containing additives are used as preservatives in dried fruits, wines, and dehydrated potato products like mashed potato flakes.’
      • ‘They also pack dehydrated foods like dried fruit and mashed potatoes.’
      • ‘He grimaced at the thought of eating dehydrated food; I described the simple pleasure of drinking ice-cold water from a mountain stream.’
      • ‘I expect to lose half a stone, as I'll only be eating dehydrated food and getting water every 10 kilometres.’
      • ‘The most dehydrated grapes in the press may not in any case yield juice until being pressed twice or three times.’
      • ‘The goal here is essentially to dehydrate the vegetables and caramelize the outside at the same time.’
      dry, dry up, dry out, desiccate, make dry, dehumidify, remove the moisture from
      View synonyms


Late 19th century: from de- (expressing removal) + Greek hudros, hudr- ‘water’.