caustic sur-face

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

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Caustic sur-face is always a great word to know.
So is interrobang. Does it mean:
a chattering or flighty, light-headed person.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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