Abbe number

Abbe number

noun Optics.
the reciprocal of the dispersive power of a substance.
Also called nu-value, relative dispersion.


Origin:
see Abbe condenser
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Abbe number is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a fool or simpleton; ninny.
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