| 1. | indigo (def. 4). |
| 2. | Also called indigo, indigotin. a dark-blue, water-insoluble, crystalline powder, C16H10N2O2, having a bronzelike luster, the essential coloring principle of which is contained along with other substances in the dye indigo and which can be produced synthetically. |
[in-di-goh] 
noun, plural -gos, -goes, adjective | 1. | a blue dye obtained from various plants, esp. of the genus Indigofera, or manufactured synthetically. |
| 2. | indigo blue (def. 2). |
| 3. | any of numerous hairy plants belonging to the genus Indigofera, of the legume family, having pinnate leaves and clusters of usually red or purple flowers. |
| 4. | a color ranging from a deep violet blue to a dark, grayish blue. |
| 5. | Also called indigo-blue, indigotic. of the color indigo. |