colouring

noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about colouring at Wordnik → Where our words come from →

1. A digestible substance used to give color to food.

   food color made from vegetable dyes

2. A visual attribute of things that results from the light they emit or transmit or reflect.

   a white color is made up of many different wavelengths of light

3. The act or process of changing the color of something.