hidrógeno

n. hydrogen, colorless odorless gas (lightest of the known elements)

adj. hydrogenous, containing hydrogen (Chemistry)

= hydrogen.
Ex: The work of J Dewar, who liquefied hydrogen, is compared to that of H Kamerlingh Onnes, who liquefied helium = Se compara el trabajo de J. Dewar, que licuó el hidrógeno, con el de H. Kamerlingh Onnes, que licuó el helio.
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* sulfuro de hidrógeno = hydrogen sulphide [hydrogen sulfide, -USA].