Webster's Online Dictionary
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Definition: INDOL

Part of Speech Definition
Noun 1. A white, crystalline substance, C8H7N, obtained from blue indigo, and almost all indigo derivatives, by a process of reduction. It is also formed from albuminous matter, together with skatol, by putrefaction, and by fusion with caustic potash, and is present in human excrement, as well as in the intestinal canal of some herbivora.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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"Indol" is a common misspelling or typo for: indole.

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

Note: Indol \In"dol\, noun. [Indigo -ol of phenol.]. (references)

Definition: INDOL

Part of SpeechDefinition
Noun1. A white, crystalline substance, C8H7N, obtained from blue indigo, and almost all indigo derivatives, by a process of reduction. It is also formed from albuminous matter, together with skatol, by putrefaction, and by fusion with caustic potash, and is present in human excrement, as well as in the intestinal canal of some herbivora.[Websters].

Source: Webster's Revised Unabridged Dictionary (1913)

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

Note: Indol \In"dol\, noun. [Indigo -ol of phenol.]. (references)