caustic surface

caustic surface

noun Optics.
the surface to which all light rays emanating from a single point and reflected by a curved surface, as a concave mirror, are tangent.
Also called caustic.


Origin:
1865–70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Caustic surface is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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