What is "diacaustic"

Diacaustic \Di`a*caus"tic\, a. [Pref. dia- + caustic.] (Opt.) Pertaining to, or possessing the properties of, a species of caustic curves formed by refraction. See Caustic surface, under Caustic.

Diacaustic \Di`a*caus"tic\, n.

1. (Med.) 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.

2. (Math.) A curved formed by the consecutive intersections of rays of light refracted through a lens. ||

a. Relating to the caustic curves formed by the refraction of light. n. 1 A refracting lens, which can be used to cauterise. 2 The curve or surface formed by the intersection of refracted light rays.