diacausticadj.n.

/dʌɪəˈkɔːstɪk/

Etymology: < Greek διά through, across + καυστικός burning, < καίειν to burn. Compare French diacaustique.

A. adj.

1. Mathematics. Of a surface or curve: Formed by the intersection of refracted rays of light. (Opposed to catacaustic: see caustic adj. 3.)

ΚΠ

1704 J. Harris Lexicon Technicum I. Pref. sig. A iij The Nature and Properties of Catacaustick and Diacaustick Figures.

1728 E. Chambers Cycl. (at cited word) The Curve-Line, which touches all the refracted Rays, is call'd the Diacaustic.

1868 Chambers's Encycl. II. 693/1 When the caustic curve is..formed by refraction, it is called the Diacaustic Curve.

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†2. Medicine. ‘Formerly applied to a double convex lens or burning glass, such having been used to cauterize parts’ (Mayne, Exp. Lex. 1851–60). Obsolete.

B. n.

1. Mathematics. A diacaustic curve or surface; a caustic by refraction.

ΚΠ

1728 E. Chambers Cycl. at Caustics Caustics are divided into Catacaustic, and Diacaustic.

1841 Penny Cycl. XIX. 356 The caustics formed by the continued intersections of refracted rays emanating from a luminous point, are called diacaustics.

1869 J. Tyndall Notes 9 Lect. on Light §166 Spherical lenses have their caustic curves and surfaces (diacaustics) formed by the intersection of the refracted rays.

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†2. Medicine. A double convex lens used to cauterize. Obsolete.

This entry has not yet been fully updated (first published 1895; most recently modified version published online June 2022).

单词	diacaustic
释义	diacausticadj.n. /dʌɪəˈkɔːstɪk/ Etymology: < Greek διά through, across + καυστικός burning, < καίειν to burn. Compare French diacaustique. A. adj. 1. Mathematics. Of a surface or curve: Formed by the intersection of refracted rays of light. (Opposed to catacaustic: see caustic adj. 3.) ΚΠ 1704 J. Harris Lexicon Technicum I. Pref. sig. A iij The Nature and Properties of Catacaustick and Diacaustick Figures. 1728 E. Chambers Cycl. (at cited word) The Curve-Line, which touches all the refracted Rays, is call'd the Diacaustic. 1868 Chambers's Encycl. II. 693/1 When the caustic curve is..formed by refraction, it is called the Diacaustic Curve. Categories » †2. Medicine. ‘Formerly applied to a double convex lens or burning glass, such having been used to cauterize parts’ (Mayne, Exp. Lex. 1851–60). Obsolete. B. n. 1. Mathematics. A diacaustic curve or surface; a caustic by refraction. ΚΠ 1728 E. Chambers Cycl. at Caustics Caustics are divided into Catacaustic, and Diacaustic. 1841 Penny Cycl. XIX. 356 The caustics formed by the continued intersections of refracted rays emanating from a luminous point, are called diacaustics. 1869 J. Tyndall Notes 9 Lect. on Light §166 Spherical lenses have their caustic curves and surfaces (diacaustics) formed by the intersection of the refracted rays. Categories » †2. Medicine. A double convex lens used to cauterize. Obsolete. This entry has not yet been fully updated (first published 1895; most recently modified version published online June 2022). < adj.n.1704
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