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hydrogen ['haɪdrəʤ(ə)n] n
med.	هيدْروجِين (العنصر الاول)
hydrogen A flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding n
environ.	هيدروجين

hydrogen ion: 2 phrases in 2 subjects

Acridology	1
Water supply	1