1. diacaustic - Noun
2. diacaustic - Adjective
Pertaining to, or possessing the properties of, a species of caustic curves formed by refraction. See Caustic surface, under Caustic.
That which burns by refraction, as a double convex lens, or the sun's rays concentrated by such a lens, sometimes used as a cautery.
A curved formed by the consecutive intersections of rays of light refracted through a lens.
Source: Webster's dictionary