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

 

floater

 noun
noun
BrE BrE//ˈfləʊtə(r)//
 
; NAmE NAmE//ˈfloʊtər//
 
(medical)
 
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a very small object inside a person’s eye which they see moving up and down
See the Oxford Advanced American Dictionary entry: floater