ˈgwäsh, güˈä-, gəˈwä- noun
( -s )
Etymology: French, from Italian guazzo, literally, puddle, from a southern Italian dialect word derived from Latin aquatio action of fetching water, watering, watering place, from aquatus (past part of aquari to fetch water, from aqua water) + -io -ion — more at island
1. : a method of painting with opaque colors that have been ground in water and mingled with a preparation of gum
2.
a. : a picture painted by gouache
b. : the pigment used in gouache