Indigo Definition

indigoes, indigos
A blue dye, C16H10N2O2, obtained from certain plants, esp. a plant (Indigofera tinctoria) native to India, or made synthetically, usually from aniline.
Webster's New World
Any of a genus (Indigofera) of plants of the pea family that yield indigo.
Webster's New World
Any of several related plants, especially those of the genera Amorpha and Baptisia.
American Heritage
A deep violet-blue color, designated by Newton as one of the seven prismatic or primary colors.
Webster's New World
The hue of that portion of the visible spectrum lying between blue and violet, evoked in the human observer by radiant energy with wavelengths of approximately 420 to 450 nanometers; a dark blue to grayish purple blue.
American Heritage
Of this color.
Webster's New World

Other Word Forms of Indigo


indigoes, indigos

Origin of Indigo

  • Spanish índigo Dutch indigo (from Portuguese endego) both from Latin indicum from Greek Indikon (pharmakon) Indian (dye) neuter of Indikos of India from India India from Indos the Indus River from Old Persian Hinduš Sind Hindi

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Spanish indico, Portuguese endego, or Dutch (via Portuguese) indigo, all from Latin indicum (“indigo”), from Ancient Greek Ἰνδικὸν (Indikon, “Indian dye”), from Ἰνδία (India).

    From Wiktionary

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