hippo

A hippo is linguistically a horse wearing river gear: the Greek ἵππος (hippos) meant “horse,” while ἱπποπόταμος meant “river horse.” Ancient Greek speakers were not claiming that this enormous African animal looked much like a stallion; they were naming it by resemblance to a horse-shaped creature that lived in water. English waited until 1872 to chop the formidable hippopotamus down to the friendlier hippo. The animal also lurks behind the biblical “behemoth”: one competing explanation connects that word to Egyptian pehemau, “water-ox,” though the traditional account derives it through Hebrew. So every time someone says hippo, they are using a tiny nickname that still carries an ancient Greek signpost reading “horse this way”—toward a river.