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Definitions:
Noun
                                                
                        
                            river dolphin
                        
                                                
                                                    
                
                    
                    Definition: any of several long-snouted usually freshwater dolphins of South America and southern Asia
Definition: Any dolphin that is found only in fresh or brackish water, now considered in one of three superfamilies Platanistoidea, †Lipotoidea, Inioidea, all in parvorder Odontoceti or in a grouping with hippopotamuses.