n. A small roll of aromatic paste, composed of gum-benzoin, sandalwood, spices, charcoal-powder, etc., designed to be burned as a fumigator, disinfectant, etc.n. A kind of sugared confection, usually of strong flavor, of a round flat shape, like peppermint-drops.n. In art: A thin round cake of water-color, of French origin, in consistency between the old hard cake and the tube-color.n. The method of painting with colors prepared as pastils, or a drawing produced by means of them.n. In pyrotechny, a paper case filled with a burning composition, intended to cause the rotation of a wheel or similar object to the periphery of which it is attached, on the principle of the pin-wheel or catharine-wheel.To burn pastils; fumigate.