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Definition of hydrogen noun from the Oxford Advanced Learner's Dictionary

hydrogen

noun
 
 
/ˈhaɪdrədʒən/
 
/ˈhaɪdrədʒən/
[uncountable]
(symbol H)
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  1. a chemical element. Hydrogen is a gas that is the lightest of all the elements. It combines with oxygen to form water.Topics Physics and chemistryc1
    Oxford Collocations DictionaryHydrogen is used before these nouns:
    • bomb
    • fuel
    • gas
    • …
    See full entry
    Word Originlate 18th cent.: coined in French from Greek hudro- ‘water’ + -genēs ‘-born, of a specified kind’, from gen- (root of gignomai ‘be born, become’, genos ‘a kind’).
See hydrogen in the Oxford Advanced American DictionarySee hydrogen in the Oxford Learner's Dictionary of Academic English
Check pronunciation: hydrogen

Nearby words

hat-trick
noun
 
 
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