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

 

tooltip

 noun
noun
BrE BrE//ˈtuːltɪp//
 
; NAmE NAmE//ˈtuːltɪp//
 
(computing)
 
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a message that appears when you move a cursor over an image, a symbol, a link, etc. on a computer screen Moving your mouse over an icon displays a tooltip explaining its function.