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gouache (n.)

method of painting, 1868, from French gouache "watercolors, water-color painting" (18c.), from Italian guazzo "watercolor," originally "spray, splash, puddle, pool," from Latin aquatio "watering, watering place," from aquatus, past participle of aquari "to bring water for drinking," from aqua "water" (from PIE root *akwa- "water").

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Definitions of gouache from WordNet

gouache (n.)
an opaque watercolor prepared with gum;
gouache (n.)
a watercolor executed with opaque watercolors mixed with gum;
From wordnet.princeton.edu