INDOLES

\ˈɪndə͡ʊlz], \ˈɪndə‍ʊlz], \ˈɪ_n_d_əʊ_l_z]\
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2010 - New Age Dictionary Database
By Oddity Software
 
1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.
 
1846 - Medical lexicon: a dictionary of medical science
By Robley Dunglison