from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a caustic curve formed by light reflecting from a curved surface
- n. the envelope of all rays that emanate from a specified point (the radiant point) and reflect from a given curve; the evolute of the orthotomic
from the GNU version of the Collaborative International Dictionary of English
- adj. Relating to, or having the properties of, a caustic curve formed by reflection. See caustic, a.
- n. A caustic curve formed by reflection of light.
from The Century Dictionary and Cyclopedia
- In geometry, belonging to caustic curves formed by reflection.
- n. In optics, a caustic curve formed by the reflection of the rays of light: so called to distinguish it from the diacaustic, which is formed by refracted rays. See caustic, n., 3.
Sorry, no etymologies found.
You know the ordinary nephroid as the reflected catacaustic of a circle, the involute of Caley’s sextic, and a generally good-natured two-cusped epicycloid.