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TOEFL IELTS BNC: 5200 COCA: 5103

hydrogen

hydrogen /ˈhaɪdrəʤən/ noun
hydrogen
/ˈhaɪdrəʤən/
noun
Learner's definition of HYDROGEN
[noncount]
: a chemical element that has no color or smell and that is the simplest, lightest, and most common element

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