Tardigrada
Tardigrada , noun, plural
[New Latin See Tardigrade, a.]
1.
(Zoology) A tribe of edentates comprising the sloths. They are noted for the slowness of their movements when on the ground. See Sloth, 3.
2.
(Zoology) An order of minute aquatic arachnids; -- called also bear animalcules, sloth animalcules, and water bears.