• Webster's Revised Unabridged Dictionary
    • n Helenin (Chem) A neutral organic substance found in the root of the elecampane (Inula helenium), and extracted as a white crystalline or oily material, with a slightly bitter taste.
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Century Dictionary and Cyclopedia
    • n helenin A substance (C6H8O) derived from the root of Inula helenium, or elecampane, by the action of alcohol. It crystallizes in white prisms which have a bitter taste.
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In literature:

Simultaneously the Germans discharged thirteen gas waves from the Helenin-Borovno sector.
"The Story of the Great War, Volume VI (of VIII)" by Various
When freed from the accompanying inula-camphor by repeated crystallization from alcohol, helenin melts at 110 deg.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2" by Various