Hypertext Webster Gateway: "diacaustic"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
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