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Definition of astigmatism noun from the Oxford Advanced Learner's Dictionary

astigmatism

noun
 
/əˈstɪɡmətɪzəm/
 
/əˈstɪɡmətɪzəm/
[uncountable] (medical)
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  1. a fault in the shape of a person’s eye that prevents them from seeing clearly
    Word Originmid 19th cent.: from a- ‘without’ + Greek stigma ‘point’ + -ism.
See astigmatism in the Oxford Advanced American Dictionary
trait
noun
 
 
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