Etymology
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hippo (n.)

short for hippopotamus, attested from 1872.

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Definitions of hippo
1
hippo (n.)
massive thick-skinned herbivorous animal living in or around rivers of tropical Africa;
Synonyms: hippopotamus / river horse / Hippopotamus amphibius
2
Hippo (n.)
an ancient Numidian town in northwestern Africa adjoining present-day Annaba in northeastern Algeria;
Synonyms: Hippo Regius
From wordnet.princeton.edu