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)

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019