hydrogen

Từ điển Oxford Advanced Learner 8th

hydro·gen BrE [ˈhaɪdrədʒən] NAmE [ˈhaɪdrədʒən] noun uncountable (symb. H)
a chemical element. Hydrogen is a gas that is the lightest of all the elements. It combines with ↑oxygen to form water.

Word Origin:
[hydrogen] late 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’).

• Từ đồng nghĩa / Synonyms:
  H, atomic number 1