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Airy disc

[air-ee] /ˈɛər i/
noun, Optics.
the bright central part of the diffraction pattern of light from a point source that is diffracted by a circular aperture.
Origin of Airy disc
named after Sir George Biddel Airy (1801-92) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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