From the word retable or "behind the altar," the word retablo refers to devotional paintings on sheets of tin coated iron, which depict saints and religious figures. Retablos are an art form which flourished during the second half of the nineteenth century in Mexico.
vertical element positioned above an altar, or the wall behind the altar, with artistic decorative work.
(Spanish) A retable, or large backdrop for an altar in a church made of wood or masonry. In Spanish America, retablos traditionally framed sculpted images of saints and church figures or were painted with such images.
(Traditional) A painting with a religious theme on a flat surface which is usually a pine board or tin. If made of pine, the board is hand-adzed, smoothed in front, covered with gesso and painted. See Santo
In the world of folklore, a retablo (or lamina) is a small oil painting on any variety of surface, typically a wood carving. The Latin etymology of this Spanish word means "board behind"http://buscon.rae.es/draeI/SrvltGUIBusUsual?LEMA=retablo&TIPO_HTML=2&FORMATO=ampliado Diccionario de la Real Academia Española. Used to honor different saints of the Catholic Church, the retablo grew in popularity as the indigenous people of South America were converted by Catholic missionaries.