| 释义 |
diacaustic, a. and n.|daɪəˈkɔːstɪk|
[f. Gr. διά through, across + καυστικός burning, f. καίειν to burn. Cf. F. diacaustique.]
A. adj.
1. Math. Of a surface or curve: Formed by the intersection of refracted rays of light. (Opp. to catacaustic: see caustic a. 3.)
1704J. Harris Lex. Techn. Pref. A iij, The Nature and Properties of Catacaustick and Diacaustick Figures. 1727–51Chambers Cycl., Diacaustic Curve, or Caustic by refraction..the curve line, which touches all the refracted rays, is called the diacaustic. 1868Chambers' Encycl. II. 693/1 When the caustic curve is..formed by refraction, it is called the Diacaustic Curve.
†2. Med. ‘Formerly applied to a double convex lens or burning glass, such having been used to cauterize parts’ (Mayne, Exp. Lex. 1851–60). Obs.
B. n.
1. Math. A diacaustic curve or surface; a caustic by refraction.
1727–51Chambers Cycl. s.v. Caustics, Caustics are divided into catacaustics, and diacaustics. 1841Penny Cycl. XIX. 356 The caustics formed by the continued intersections of refracted rays emanating from a luminous point, are called diacaustics. 1869Tyndall Notes Lect. Light §166 Spherical lenses have their caustic curves and surfaces (diacaustics) formed by the intersection of the refracted rays.
†2. Med. A double convex lens used to cauterize. Obs. |