indigoid

indigoid

[in-di-goid]
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:
1905–10; indig(o) + -oid

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World English Dictionary
indigoid (ˈɪndɪˌɡɔɪd)
 
adj
1.  of, concerned with, or resembling indigo or its blue colour
 
n
2.  any of a number of synthetic dyes or pigments related in chemical structure to indigo

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