Tär'di-grā'dă, n. pl.

nounplural

*_Tär'di-grā'dă_, n. pl. [See infra.] (Zoöl.) (a.) A family of edentate mammals, remarkable for the slowness of their motions; the sloths. (b.) A family of minute animals of the class Arachnidae; the water-bears. Baird*.