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.
A traditional ground painting on panel. Usually made from a white pigment and an inert filler (e.g. gypsum, champagne chalk, powdered marble) bound together with animal hide glue. Pronounced jesso. See also acrylic 'gesso' and ground.
The painting surface of an icon, comprising a (varying) mix of chalk, marble dust, alabaster, which is mixed with size and burnished to a fine finish