| http://www.w3.org/ns/prov#value | - Date: 1700-1800 Language: French Origin: hydrog??ne, from hydro- ( HYDRO-) + -g??ne 'producing'; because it produces water when it is burned hydrogen noun hy???dro???gen [uncountable]HCE a colourless gas that is the lightest of all gases, forms water when it combines with oxygen, and is used to produce ammonia and other chemicals.
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