COLOURING
coloring, colouring
(noun) the act or process of changing the color of something
color, colour, coloring, colouring
(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”
coloring, colouring, food coloring, food colouring, food color, food colour
(noun) a digestible substance used to give color to food; “food color made from vegetable dyes”
Source: WordNet® 3.1
Noun
colouring (countable and uncountable, plural colourings)
(British, Canada) Alternative spelling of coloring
Verb
colouring
present participle of colour
Source: Wiktionary
COLOUR
Col"our, n.
Definition: See Color.
Source: Webster’s Unabridged Dictionary 1913 Edition