Theroid
animal; having animal proapplied to idiots, who in habits or appearance resemble any of the lower animals. Cyc. Vol. IX THEROID The word is of recent introduction, but the extraordinary resemblances presented by some of the weak-minded to certain birds and mammals have attracted attention for a very long period. Pinel speaks of "a young female idiot * * * who, in the form of her head, her tastes, her mode of living, seemed to approach to the instincts of a sheep."