tardigrada

Tardigrada

Tar`di*gra"da\, n. pl. [NL. See Tardigrade, a.]

1. (Zo["o]l.) A tribe of edentates comprising the sloths. They are noted for the slowness of their movements when on the ground. See Sloth, 3.

2. (Zo["o]l.) An order of minute aquatic arachnids; -- called also bear animalcules, sloth animalcules, and water bears.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
tardigrada

noun
in some classifications considered a separate phylum: microscopic arachnid-like invertebrates living in water or damp moss having 4 pairs of legs and instead of a mouth a pair of stylets or needlelike piercing organs connected with the pharynx 
WordNet® 3.0, © 2006 by Princeton University.
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