from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A surface to which rays reflected or refracted by another surface are tangents.
from the GNU version of the Collaborative International Dictionary of English
- adj. a surface to which rays reflected or refracted by another surface are tangents. Caustic curves and surfaces are called catacaustic when formed by reflection, and diacaustic when formed by refraction.
- n. etc. See under Caustic, Heating, etc.
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