gouache (n.)

method of painting, 1882, 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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