gouache /gwɑʃ, guˈɑʃ; Fr. gwaʃ/
–noun, plural gouach·es /ˈgwɑʃɪz, guˈɑʃɪz; Fr. ˈgwaʃ/
1. a technique of painting with opaque watercolors prepared with gum.
2. an opaque color used in painting a gouache.
3. a work painted using gouache.
1880–85; < F < It guazzo place where there is water ≪ L aquātiō, deriv. of aqua water
—Can be confused: gauche, gouache.
While he was still at school … he painted hundreds of gouache pictures and was famous among his school friends for his caricatures of teachers.
Source: Immortality by Milan Kundera.