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Meaning of indigoid

in•di•goid

Pronunciation: (in'di-goid"), [key]
— adj.
  1. of or pertaining to that group of vat dyes that have a molecular structure similar to that of indigo.
—n.
  1. an indigoid substance.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.