dolphin(redirected from Aquatic mammal dolphin)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
a member of the suborder Odonotoceti of the order Cetacea, the whales. Includes the Amazon and Ganges freshwater dolphins, the common dolphin (Delphinus delphis) and the bottle-nosed dolphins (Tursiops truncatus), and the Arctic dolphin, more commonly called the beluga whale. Others include Chinese river dolphin (Lipotes vexillifer).