From The Collaborative International Dictionary of English v.0.44 [gcide]:
Houyhnhnm \Hou*yhnhnm"\, noun 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.
From WordNet (r) 2.0 [wn]:
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