arsine
noun
ar·sine är-ˈsēn 
ˈär-ˌsēn
: a colorless flammable extremely poisonous gas AsH3 with an odor like garlic
also : a derivative of arsine
Example Sentences
Recent Examples on the Web The reason for the latter recommendation is that arsenic has a tendency to transform to the airborne arsine (AsH3) given the right conditions of humidity and light. 
James Rogers, Fox News, 6 July 2018
James Rogers, Fox News, 6 July 2018 Word History
Etymology
borrowed from French, from arsenic arsenic entry 1 + -ine -ine entry 2
Note: The term was introduced by the Alsace-born chemist Charles Frédéric Gerhardt (1816-56) in Précis de chimie organique, tome 1 (Paris, 1844), p. 389.
First Known Use
1851, in the meaning defined above
Medical Definition
arsine
noun
ar·sine är-ˈsēn, ˈär-ˌ
: a colorless flammable extremely poisonous gas AsH3 with an odor like garlic
also : a derivative of arsine