tardigrade /ˈtɑɹdɪˌɡɹeɪd/noun 2adjective 1forms 3 noun2 •A member of the animal phylum Tardigrada. •(no longer used) A sloth, a neotropical mammal of suborder Folivora (syn. Tardigrada). adjective1 •Sluggish; moving slowly.Each tendril ending in a perfect claw, / Obeys the whole routine of Nature's law; / Transforms each sinus to a sylvan shade, / Though p'rhaps its force is rather tardigrade. — 1850 formstardigrades · more tardigrade · most tardigrade