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1. A potassium salt, C8H6NO4SK, found in urine and formed by the conversion of tryptophan to indole by intestinal bacteria.
2. A glucoside, C14H17NO6, found in the indigo plant and used as a source for indigo dye.

[Latin indicum, indigo; see indigo + -an.]
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.


(Biochemistry) a compound secreted in the urine, usually in the form of its potassium salt; indoxylsulphuric acid. Formula: C8H6NOSO2OH
[C19: from Latin indicum indigo + -an]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈɪn dɪ kən)

1. a glucoside, C14H17NO6, that occurs in plants yielding indigo and from which indigo is obtained.
2. indoxyl potassium sulfate, C8H6NO4SK, a component of urine.
[< German (1885) < Latin indic(um) indigo + German -an -an2]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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By adding a sugar molecule, the indoxyl is turned into indican -- a precursor of indigo.