Webster's Revised Unabridged Dictionary · 1913

Tardigrade

Tardigrade , adjective

[Latin tardigradus; tardus slow + gradi to step: compare French tardigrade.]

1.
Moving or stepping slowly; slow-paced. [Rare] — G. Eliot
2.
(Zoology) Of or pertaining to the Tardigrada.

Tardigrade , noun

(Zoology) One of the Tardigrada.