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hy'drogen sul'fide

a colorless, flammable, water-soluble, cumulatively poisonous gas, H₂S, having the odor of rotten eggs: used chiefly in the manufacture of chemicals, in metallurgy, and as a reagent in laboratory analysis. Also called sulfureted hydrogen.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

hydrogen peroxide

hydrogeology

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