- noun a substance that gives colour to a part of an organism, e.g. melanin in animals or chlorophyll in plants
- A coloring matter, usually in the form of an insoluble fine powder, dispersed in a liquid vehicle to make paint.
- noun a substance that gives colour to parts of the body such as blood, the skin and hair
- noun a substance which gives colour to part of the body such as blood, the skin or hair
- noun the colouring substance in ink