Dictionary  ar•sinePronunciation: (är-sēn', är'sēn, -sin), [key] —n. Chem. 1. Also called arseniuretted hydrogen. a colorless, flammable, slightly water-soluble gas, AsH3, having a fetid, garliclike odor, used in chemical warfare. 2. any derivative of this compound in which one or more hydrogen atoms are replaced by organic groups. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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