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TOEFL IELTS BNC: 5200 COCA: 5103

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.氢;氢气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’).
TOEFL IELTS BNC: 5200 COCA: 5103
TOEFL IELTS BNC: 5200 COCA: 5103
TOEFL IELTS BNC: 5200 COCA: 5103
hydrogen
Gases: acetylene, ammonia, argon...

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