The Nuttall Encyclopedia
Name of a race of brutes, subject to the Houyhuhnms (q. v .), in "Gulliver's Travels," with the form and all the vices of men.
Wood, James, ed. Entry for 'Yahoo'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/y/yahoo.html. Frederick Warne & Co Ltd. London. 1900.