[ahr-seen, ahr-seen, -sin]
noun Chemistry.
Also called arseniuretted hydrogen. a colorless, flammable, slightly water-soluble gas, AsH 3 , having a fetid, garliclike odor, used in chemical warfare.
any derivative of this compound in which one or more hydrogen atoms are replaced by organic groups.

1875–80; ars(enic) + -ine2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arsine (ˈɑːsiːn)
a colourless poisonous gas used in the manufacture of organic compounds, to dope transistors, and as a military poisonous gas. Formula: AsH3

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Information on arsine, a potential agent for chemical terrorism.
Arsine gas poisoning results in a considerably different syndrome from that
  caused by other forms of arsenic.
Arsine is a colorless gas with a disagreeable garlic odor.
Marsh's test makes use of the formation and ready decomposition of arsine.
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