The Collaborative International Dictionary
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.
Wiktionary
n. (context chemistry English) An anthelmintic found in santonica and related plants.
Wikipedia
Santonin is a drug which was widely used in the past as an anthelminthic, a drug that expels parasitic worms ( helminths) from the body, by either killing or stunning them. Santonin was formerly listed in U.S. and British pharmacopoeia but has fallen out of use with the development of safer ascaricides and is no longer registered as a drug in most countries.
Usage examples of "santonin".
And power-white fire which crashed through the Clave, turned Santonin and the Stonemight to tinder, went reaving among the Riders to garner a harvest of blood.