The Collaborative International Dictionary
Antiarin
Antiarin \An`ti*a*rin\, n. (Chem.)
A poisonous principle obtained from antiar.
--Watts.
Wiktionary
antiarin
n. Either of two cardiac glycoside poisons produced by the upas tree (''Antiaris toxicaria'').
Wikipedia
Antiarin
Antiarins are cardiac glycoside poisons produced by the upas tree (Antiaris toxicaria). There are two forms, α-antiarin and β-antiarin.