Webster's Online Dictionary
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Definition: HELENIN

Part of Speech Definition
Noun 1. 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.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "Helenin" was first used in popular English literature: sometime before 1914. (references)

Definition: HELENIN

Part of SpeechDefinition
Noun1. 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.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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Date "HELENIN" was first used in popular English literature: sometime before 1914. (references)