indigo Definition

indigo
noun indigos, indigoes

1. A violet-blue dye either obtained naturally from a plant or made synthetically.
2. Any of several leguminous plants whose leaves yield a violet-blue dye.
3. The deep violet-blue colour of this dye.

adj

1. Violet-blue.

Etymology: 16c: Spanish índigo or índico, from Greek Indikon Indian substance (ie dye).