\Ges"so\, n. [It., chalk, plaster.]
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. A work of art done in gesso. [Obs.]