Tardigrada /(?)/

Tar·di·gra·da

Tardigrada

n. pl.
  1. A tribe of edentates comprising the sloths. They are noted for the slowness of their movements when on the ground. See Sloth, 3. (Zool.)
  2. An order of minute aquatic arachnids; -- called also bear animalcules, sloth animalcules, and water bears. (Zool.)