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Webster's 1828 Dictionary

DIACAUSTIC

a.[G., to burn or inflame. ] Belonging to curves formed by refraction.

Webster's 1913 Dictionary

DIACAUSTIC

Di `a *caus "tic, a. Etym: [Pref. dia- + caustic. ] (Opt. )

Defn: Pertaining to, or possessing the properties of, a species of caustic curves formed by refraction. See Caustic surface, under Caustic.

DIACAUSTIC

DIACAUSTIC Di `a *caus "tic, n.

1. (Med. )

Defn: 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. )

Defn: A curved formed by the consecutive intersections of rays of light refracted through a lens.