dolphin(redirected from Aquatic mammal dolphin)
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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).