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indigoid

[in-di-goid]
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adjective
  1. of or relating to that group of vat dyes that have a molecular structure similar to that of indigo.
noun
  1. an indigoid substance.

Origin of indigoid

First recorded in 1905–10; indig(o) + -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for indigoid

indigoid

adjective
  1. of, concerned with, or resembling indigo or its blue colour
noun
  1. any of a number of synthetic dyes or pigments related in chemical structure to indigo
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012