a distortion produced by a lens in which the magnification decreases toward the edge of the field.
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Compare pincushion distortion.
Origin of barrel distortion
First recorded in 1885–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for barrel distortion
photog distortion of an image produced by an optical system that causes straight lines at image margins to bulge outwards
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012