An example of indigo is a dark bluish purple iris flower.
An example of indigo is a deep purple dress with a hint of blue.
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