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

 

astigmatism

 noun
noun
BrE BrE//əˈstɪɡmətɪzəm//
 
; NAmE NAmE//əˈstɪɡmətɪzəm//
 
[uncountable](medical)
 
jump to other results
a fault in the shape of a person’s eye that prevents them from seeing clearly Word Origin mid 19th cent.: from a- ‘without’ + Greek stigma ‘point’ + -ism.
See the Oxford Advanced American Dictionary entry: astigmatism