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

 

glaucoma

 noun
noun
BrE BrE//ɡlɔːˈkəʊmə//
 
; NAmE NAmE//ɡlaʊˈkoʊmə//
 
, NAmE//ɡlɔːˈkoʊmə//
 
[uncountable]
 
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an eye disease that causes gradual loss of sight Word Origin mid 17th cent.: via Latin from Greek glaukōma, based on glaukos ‘bluish-green, bluish-grey’ (because of the grey-green haze in the pupil).
See the Oxford Advanced American Dictionary entry: glaucoma