from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. astigmatism
from The Century Dictionary and Cyclopedia
- n. Same as astigmatism.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
- n. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
Sorry, no etymologies found.
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