inˈdigoid adjective

Of, relating to or resembling indigo or its colour

Any of various synthetic dyes related in chemical structure to indigo

inˈdigotin (or /in-digˈ/) or indigo blue noun

The blue colouring matter of indigo obtained from indican by hydrolysis

indirubin /in-di-rooˈbin/ or indigo red noun

An isomer of indigotin, obtained from natural indigo

indigo bird, indigo bunting or indigo finch noun

An American finch (Passerina cyanea) of which the male is blue

indigo carmine noun

A blue dye administered by injection to test kidney function

indigo snake noun

A large non-venomous snake of N America (Drymarchon corais) with smooth blue-back skin