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Airy disc

[air-ee] /ˈɛər i/
noun, Optics.
1.
the bright central part of the diffraction pattern of light from a point source that is diffracted by a circular aperture.
Origin
named after Sir George Biddel Airy (1801-92)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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