convallamarin

from The Collaborative International Dictionary of English v.0.48

Convallamarin \Con*val`la*ma"rin\
   (k[o^]n*v[a^]l`l[.a]*m[=a]"r[i^]n), n. [Convallaria + L.
   amarus bitter.] (Chem.)
   A white, crystalline, poisonous substance, regarded as a
   glucoside, extracted from the lily of the valley
   ({Convallaria Majalis}). Its taste is first bitter, then
   sweet.
   [1913 Webster]