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Definition of watercolour
noun [mass noun] (also watercolours)
artists' paint made with a water-soluble binder such as gum arabic, and thinned with water rather than oil, giving a transparent colour: a self-portrait in watercolour [count noun]:the technique involved the use of watercolours [count noun] a picture painted with watercolours. the art of painting with watercolours, especially using a technique of producing paler colours by diluting rather than by adding white.