from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The blurring of an image that occurs when light from the margin of a lens or mirror with a spherical surface comes to a shorter focus than light from the central portion.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun optics A type of
lensaberration which causes blurriness, particularly away from the centre of the lens.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an optical aberration resulting in a distorted image
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