gouache 
(gwäsh, g-äsh)
(gwäsh, g-äsh)n.
1.
a. A method of painting with opaque watercolors mixed with a preparation of gum.
b. An opaque pigment used when painting in this way.
2. A painting executed in this manner.
[French, from Italian guazzo, from Latin aquātiō, watering, from aquātus, past participle of aquārī, to fetch water, from aqua, water; see akw-ā- in the Appendix of Indo-European roots.]