Santonin n. : 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.

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Taxonomy
santonin, dose, drug, treatment, side effects, purgative, regimens, risk, free encyclopedia, exposure, Encyclopedia Britannica, 50s, Winthrop, lozenges, herbal, yellow vision, urine, yellow color.

Defination from the web:
Santonin dissolves in alkalies with formation of salts of this carboxylic acid. ... Santonin is an organic chemical consisting of colorless flat prisms, turning slightly yellow from the action of light and soluble in alcohol, chloroform and boiling water. ...