indigo
noun
[ ˈɪndɪɡəʊ ]
• a tropical plant of the pea family, which was formerly widely cultivated as a source of dark blue dye.
• the dark blue dye obtained from the indigo plant.
Origin:
mid 16th century: from Portuguese índigo, via Latin from Greek indikon, from indikos ‘Indian (dye)’ (see Indic).
