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TOEFL IELTS BNC: 5200 COCA: 5103
hydrogen
noun [U] chemistry /ˈhaɪdrədʒən/
  1. a chemical element which is a colourless odourless gas that is lighter than air. Its symbol is H.
     Synonyms and related words
    Gases: acetylene, ammonia, argon...
TOEFL IELTS BNC: 5200 COCA: 5103
TOEFL IELTS BNC: 5200 COCA: 5103

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