tardĭgrădus, a, um, adj. [tardusgradior],
slow-paced , tardy-paced : quadrupes, Pac. ap. Cic. Div. 2, 64, 133 (Trag. v. 2 Rib.).
tardigradus adj. tardus + GRAD-, slowpaced, tardy-paced : quadrupes. ...
An Elementary Latin Dictionary