indigo

Everyday

1. A deep blue-purple colour, one of the seven colours named in the rainbow (between blue and violet). tree →
2. A dark blue dye, first made from a plant, used for colouring cloth such as jeans. tree →

In the lessons

In science the rainbow is remembered as red, orange, yellow, green, blue, indigo, violet («Richard Of York Gave Battle In Vain» or «ROY G BIV»); in art indigo is a dark blue. Phrases: «indigo blue», «indigo dye».

Examples

• Indigo comes between blue and violet in the rainbow. tree →
• Her jeans were dyed indigo. tree →
• The night sky turned deep indigo. tree →
• People once grew the indigo plant to make blue dye. tree →
• I painted the sea indigo. tree →
• How many colours are in the rainbow? Seven, including indigo. tree →

Note

Uncountable as a colour. Say «IN-di-go». Many people find indigo hard to see in a real rainbow; it was added to make seven colours.