Noah Webster
Encaustic
ENCAUS'TIC, adjective [Gr. caustic, to burn.] Pertaining to the art of enameling, and to painting in burnt wax. encaustic painting, is a method in which wax is employed to give a gloss to colors.
ENCAUS'TIC, noun Enamel or enameling.
1. The method of painting in burnt wax.