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Airy disc

[air-ee]
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noun Optics.
  1. the bright central part of the diffraction pattern of light from a point source that is diffracted by a circular aperture.
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Origin of Airy disc

named after Sir George Biddel Airy (1801–92)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018