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hydrogen chloride
hydrogen cyanide
hydrogen embrittlement
hydrogen fluoride
hydrogen iodide
hydrogen ion
hydrogen peroxide
hydrogen sulfate
hydrogen sulfide
hydrogen sulfite
hydrogen tartrate
hydrogenase
hydrogenate
hydrogenize
hydrogenolysis
hydrogenous
hydrogeology
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hydrogen sulfide
hy·dro·gen sul·fide


noun 
Definition:
 
poisonous gas smelling like rotten eggs: a colorless flammable poisonous gas with a characteristic smell of rotten eggs. Source: action of a mineral acid such as hydrochloric acid on a metal sulfide. H2S
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