gouachePronunciation: /guːˈɑːʃ, gwɑːʃ/Definition of gouache noun [mass noun] a method of painting using opaque pigments ground in water and thickened with a glue-like substance. opaque watercolour of the type used in gouache painting. [count noun] a picture painted using the gouache method. Origin: late 19th century: French, from Italian guazzogouache in other Oxford dictionaries Definition of gouache in the US English dictionary
