What is Watercolour?
Watercolour is (noun) 1. paint which is mixed with water and used by artists He prefers using watercolours to oils. 2. a picture painted using watercolours There is an exhibition of Turner’s watercolours in the Tate Gallery. She bought a watercolour of the village church. (NOTE: [all senses] The US spelling is watercolor.)
source: Easier English, Student Dictionary Upper Intermediate Level