'Gouache' definitions:

Definition of 'gouache'

(from WordNet)
noun
An opaque watercolor prepared with gum
noun
A watercolor executed with opaque watercolors mixed with gum

Definition of 'Gouache'

From: GCIDE
  • Gouache \Gouache\ (gw[.a]sh), n. [F., It. guazzo.] A method of painting with opaque colors, which have been ground in water and mingled with a preparation of gum; also, a picture thus painted. [1913 Webster]