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1. A white crystalline compound, C8H7N, obtained from coal tar or various plants and produced by the bacterial decomposition of tryptophan in the intestine. It is used in perfumes and as a reagent.
2. Any of various derivatives of this compound.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈɪndəʊl) or


(Elements & Compounds) a white or yellowish crystalline heterocyclic compound extracted from coal tar and used in perfumery, medicine, and as a flavouring agent; 1-benzopyrrole. Formula: C8H7N
[C19: from ind(igo) + -ole1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈɪn doʊl)

a colorless to yellowish solid, C8H7N, that has a low melting point and a fecal odor, is obtained from coal tar or from animal feces, and is used in perfumery and as a reagent.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
(10) Tertbutyl (2-(3-hydroxyureido)-2-(1H-indol-3-yl)ethyl) carbamate, which is not toxic to human cells, was also found to be an active indolic NorA inhibitor.
Yield: Colorless crystals (78 %); MP: 211-212 AdegC; IR vmax (KBr) cm-1: 3450 (indolic N-H), 2910, 2820 (C-H), 1610-1415 (aromatic C=C) and 1125 (C-O); EI-MS m/z (rel.
Bacterial metabolites (indole, indolic acid, and tryptamine) and endogenes (serotonin, melatonin, and kynurine) influence the microbial metabolism, microbiota composition, and host immune system [9] (Figure 1).
There are three major known pathways of melatonin degradation: (a) the classical hepatic catabolic pathway that generates 6-hydroxymelatonin that is then excreted via the kidney as a sulphate conjugate [3, 5, 25, 26]; (b) the alternative indolic pathway that produces 5-methoxyindole acetic acid or 5-methoxytryptophol [27, 28]; and (c) the kynuric pathway that produces [N.sup.1]-acetyl-[N.sup.2]-formyl-5-kynuramine (AFMK) [29-31].
Melanins are polymers of phenolic and/or indolic compounds, negatively charged, hydrophobic in nature, and with high molecular weight and unknown structure [110].
Whereby the indolic derivatives are privileged structures to design and synthetize new library of heteroaryl-acrylonitrile compounds, in this sense, the 3-(cyanoacetyl)indole is a methylene active compound that has been reported as a versatile building block to prepare a wide variety of functionalized alkenes via Knoevenagel reaction [7, 8, 53].
Widdel, "Anaerobic degradation of indolic compounds by sulfate-reducing enrichment cultures, and description of Desulfobacterium indolicum gen.
The indolic diet-derivative, 3,3'-diindolylmethane, induced apoptosis in human colon cancer cells through upregulation of NDRG1.
Indolic, quinolinic and isoquinolinic alkaloids were reported by Robbrecht (1988) in tribes of Rubiaceae.