arsine

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A colorless, flammable, very poisonous gas, AsH₃, having an odor like garlic and used in chemical warfare, as a solid-state doping agent, and in organic synthesis.

from The Century Dictionary.

• noun Arseniureted hydrogen (which see, under arseniureted).

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A compound of arsenic and hydrogen, AsH3, a colorless and exceedingly poisonous gas, having an odor like garlic; arseniureted hydrogen.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun inorganic chemistry, uncountable A compound of arsenic and hydrogen, AsH3, a colorless and exceedingly poisonous gas, having an odor like garlic.
• noun organic chemistry, countable Any organic derivative of this compound, or of diarsane, triarsane etc.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a poisonous colorless flammable gas used in organic synthesis and to dope transistors and as a poison gas in warfare