'colouring' definitions:

Definition of 'colouring'

(from WordNet)
noun
A digestible substance used to give color to food; "food color made from vegetable dyes" [syn: coloring, colouring, food coloring, food colouring, food color, food colour]
noun
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" [syn: color, colour, coloring, colouring] [ant: achromaticity, achromatism, colorlessness, colourlessness]
noun
The act or process of changing the color of something [syn: coloring, colouring]

Definition of 'colouring'

From: GCIDE
  • colouring \colouring\ n. same as coloring. [Brit.] [WordNet 1.5]