2. (Science: botany) A plant affording a blue dye; the woad (isatis tinctoria); also, the dye itself. 3. A drawing using pastel, or of a pastel shade. 4. The art or process of drawing with pastels. 5. Any of various light or pale colours. 6. A light literary work, as a sketch.
Origin: F.; cf. It. Pastello. Cf. Pastil.