Definition of sippy cup noun from the Oxford Advanced American Dictionary

 

sippy cup

 noun
noun
NAmE//ˈsɪpi ˌkʌp//
 
(informal)
 
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a cup with a lid that has holes in it so that a baby can suck liquid from it The baby was drinking milk from a sippy cup.
See the Oxford Advanced Learner's Dictionary entry: sippy cup