[im-pas-toh, -pah-stoh] n. pl. im·pas·tos
Itallian origin 1775–85; n. deriv. of impastare to impaste
Thick paint. The application of thick layers of pigment to a painting surface. Painting that applies the pigment thickly so that brush or palette knife marks are visible.
Usually only referred to when thick pigment is applied over a majority of the artwork. It often draws you attention so much so that it may become the focal point. Impasto is tactile creating texture to the touch. The raised paint reflects light differently than a flatter surface and it takes a very long time for the paint under the surface to dry throughly.