GESSO

‖Ges″so (?), n. [] 1. 1. Plaster of Paris, or gypsum, esp. as prepared for use in painting, or in making bas-reliefs and the like; by extension, a plasterlike or pasty material spread upon a surface to fit it for painting or gilding, or a surface so prepared.
2. 2. A work of art done in gesso.