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Definition of belly button noun from the Oxford Advanced Learner's Dictionary

belly button

noun
 
/ˈbeli bʌtn/
 
/ˈbeli bʌtn/
(also tummy button)
(informal)
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  1. the navel (= the small round part in the middle of the stomach, on the front of somebody's body, where the umbilical cord was cut at birth)Topics Bodyc2
See belly button in the Oxford Advanced American Dictionary

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