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indigoid

[in-di-goid] /ˈɪn dɪˌgɔɪd/
adjective
1.
of or pertaining to that group of vat dyes that have a molecular structure similar to that of indigo.
noun
2.
an indigoid substance.
Origin
1905-1910
1905-10; indig(o) + -oid
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for indigoid

indigoid

/ˈɪndɪˌɡɔɪd/
adjective
1.
of, concerned with, or resembling indigo or its blue colour
noun
2.
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
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