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|Noun||1.||family Hippopotamidae - hippopotami|
mammal family - a family of mammals
Artiodactyla, order Artiodactyla - an order of hooved mammals of the subclass Eutheria (including pigs and peccaries and hippopotami and members of the suborder Ruminantia) having an even number of functional toes
genus Hippopotamus - type genus of the Hippopotamidae