hydrogen

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++

Related topics: Elements

hy·dro·gen /ˈhaɪdrədʒən/ ●●○ noun [uncountable]  HCEa 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. It is a chemical element: symbol H 氢〔一种化学元素，符号为H〕

Examples from the Corpus

hydrogen• The transient nature of the binding may be because this sequence is recognized on account of its structure without additional hydrogen bonding contacts.• In this case the presence of oxygen and hydrogen mixed in the optimum proportions, could well have compounded the effect.• The vaporized gasoline is processed into hydrogen, water and carbon dioxide.• Ultraviolet light, hydrogen peroxide and ozone assure crystal-clear, clean water.• For all they know, metal hydrogen may always be unstable and quickly vaporize.• A biochemist colleague has kindly provided me with a bottle of hydrogen peroxide, and enough hydroquinone for 50 bombardier beetles.• The large scale release of fusion energy has so far occurred only in stars and in the hydrogen bomb.• Expressed as the proportion of carbon to hydrogen, fuelwood is roughly 91 percent carbon.Origin hydrogen (1700-1800) French hydrogène, from hydro- ( → HYDRO-) + -gène “producing”; because it produces water when it is burned

hy·dro·gen nounChineseSyllable  

of lightest a gas is colourless Corpus all the that

hydrogen
hy‧dro‧gen /ˈhaɪdrədʒən/ noun [uncountable]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. It is a chemical element: symbol H

hydro·genBrE /ˈhaɪdrədʒən/ 🔊NAmE /ˈhaɪdrədʒən/ 🔊 noun [uncountable] (symbol H) a chemical element. Hydrogen is a gas that is the lightest of all the elements. It combines with oxygen to form water. 氢；氢气