Santonin \San"to*nin\, n. [L. herba santonica, a kind of plant,
fr. Santoni a people of Aquitania; cf. Gr. ?: cf. F.
santonine.] (Chem.)
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.
[1913 Webster]