- a hippopotamus.
Origin of river horse
First recorded in 1595–1605
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for river horse
His name is Greek, and, as every one knows, signifies the River-horse.
I felt sure it would stick, but it must have astonished that river-horse.
It is just as inappropriate as that of “river-horse” (hippopotamus).The Vee-Boers
It is only when his head is half-submerged that we can correctly designate him as a river-horse.My Kalulu, Prince, King and Slave
Henry M. Stanley
I saw the gigantic “river-horse,” wallowing through the flood, and dragging his clumsy body out upon the bank.Ran Away to Sea
- an informal name for the hippopotamus
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012