Crossword clues for tardigrada tardigrada 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 needle-like piercing organs connected with the pharynx The Collaborative International Dictionary Tardigrada Tardigrada \Tar`di*gra"da\, n. pl. [NL. See Tardigrade, a.] (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. (Zo["o]l.) An order of minute aquatic arachnids; -- called also bear animalcules, sloth animalcules, and water bears.