Santonin
Santonin , noun
[Latin herba santonica, a kind of plant, from Santoni a people of Aquitania; compare Greek {not transcribed}: compare French santonine.]
(Chemistry) A white crystalline substance having a bitter taste, extracted from the buds of levant wormseed and used as an anthelmintic. It occassions a peculiar temporary color blindness, causing objects to appear as if seen through a yellow glass.