- 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 chemistryc1Oxford Collocations DictionaryHydrogen is used before these nouns:
- bomb
- fuel
- gas
- …
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’).Want to learn more?
Find out which words work together and produce more natural sounding English with the Oxford Collocations Dictionary app.
Check pronunciation:
hydrogen