Newton\'s rings

noun Optics.

the pattern of light interference produced by the contact of the convex surface of a lens with a plane glass plate, appearing as a series of concentric, alternately bright and dark rings, which are colored if the light source is white.

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Origin:
1825–35; after I. Newton, who discovered them

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Newton's rings is always a great word to know.

So is ninnyhammer. Does it mean:

a fool or simpleton; ninny.

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

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