1. (常指为便于保存而）使(食品等)脱水，使干燥
When something such as food is dehydrated, all the water is removed from it, often in order to preserve it.

1. lose water or moisture

e.g. In the desert, you get dehydrated very quickly

Synonym: exsiccatedry updesiccate

2. remove water from

e.g. All this exercise and sweating has dehydrated me

Synonym: desiccate

3. preserve by removing all water and liquids from

e.g. carry dehydrated food on your camping trip

Synonym: desiccate