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Many words in English are based on the same root words, and knowing what these mean can help us with spellings.

a hand under running water

The root word 'hydro' (sometimes spelt 'hydra') comes from the Greek word for water, and it forms part of a lot of words in English.

for example:

The gas that combines with oxygen to make water is called hydrogen.

 

Someone who feels unwell because they haven't drunk enough water is said to be dehydrated.

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