arsine

[ahr-seen, ahr-seen, -sin]

ar·sine

[ahr-seen, ahr-seen, -sin]
noun Chemistry.
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.

Origin:
1875–80; ars(enic) + -ine2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Arsine is always a great word to know.
So is formaldehyde. Does it mean:
any of the electronegative elements, fluorine, chlorine, iodine, bromine, and astatine, that form binary salts by direct union with metals
a colorless, toxic, water-soluble gas having a suffocating odor, used chiefly as a disinfectant and preservative, contained in resins and plastics
Collins
World English Dictionary
arsine (ˈɑːsiːn)
 
n
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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