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Use "hippopotami" in a sentence
"The water-elephants, as the natives term the hippopotami, frequently came snorting near us, but fortunately did not touch our canoe."
"Although I do also tend to say "hippopotami": I hold that the pluralising rule -us - -i for words marked +classical is perfectly good English morphology, and I quite like the sound of other persons' teeth grinding."
"The exotic animals such as hippopotami, elephants and rhinoceroses that were all part of the huge show going on each night would be easy to view from anywhere in the stadium."