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The Collaborative International Dictionary
smilacin

Parillin \Pa*ril"lin\, n. [Shortened fr. sarsaparillin.] (Chem.) A glucoside resembling saponin, found in the root of sarsaparilla, smilax, etc., and extracted as a bitter white crystalline substance; -- called also smilacin, sarsaparilla saponin, and sarsaparillin.

Wiktionary
smilacin

n. sarsaparillin