flipperflip‧per /ˈflɪpɚ/ noun [countable] 
1
science, biology a flat part on the body of some large sea animals, used for pushing themselves through water2a large flat rubber shoe that you use in order to help you swim faster
1 science, biology a flat part on the body of some large sea animals, used for pushing themselves through water2a large flat rubber shoe that you use in order to help you swim faster
