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hydrogen

hy·dro·gen

hydrogen

pronunciation:
haI dr jn
features:
Word Explorer, Word Parts
part of speech: noun
definition: a chemical element that contains one proton in each nucleus and that occurs naturally in many compounds such as water, acids, petroleum hydrocarbons, and carbohydrates, and in pure form as a highly flammable, lighter-than-air gas used in many industrial applications, such as the hydrogenation of fats and oils. (symbol: H) (Cf. deuterium, protium, tritium.)
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  cell, element, water