(n.) One of the race of horses described by Swift in his imaginary travels of Lemuel Gulliver. The Houyhnhnms were endowed with reason and noble qualities; subject to them were Yahoos, a race of brutes having the form and all the worst vices of men.

Houyhnhnm Partlet biddy bitch bossy charger colt courser cow critter dobbin doe entire entire horse equine ewe ewe lamb filly foal gelding guinea hen gyp heifer hen hind horse jenny lioness mare mount nag nanny nanny goat peahen prancer roe she-bear she-goat she-lion slut sow stallion steed stud studhorse tarpan tigress top horse vixen war-horse wild horse