WordReference Random House Unabridged Dictionary of American English © 2017
in•dole  (indōl),USA pronunciation n. [Chem.]
  1. Chemistrya colorless to yellowish solid, C8H7N, having a low melting point and a fecal odor, found in the oil of jasmine and clove and as a putrefaction product from animals' intestines: used in perfumery and as a reagent.
  • ind- + -ole2 1865–70

Collins Concise English Dictionary © HarperCollins Publishers::

indole /ˈɪndəʊl/, indol /ˈɪndəʊl -dɒl/ n
  1. 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
Etymology: 19th Century: from ind( igo) + -ole1

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