Lewis Short
(adjective) : tardĭgĕmŭlus (tardĭng-), a, um, tardus-gemo
* Slow-moaning: tardingemulo senio oppressus, Laev. ap. Gell. 19, 7, 3: tardigenulo, i. e. tardigrado (cf.: tarda trementi Genua labant,Verg. A. 5, 431).
Charlton T. Lewis, Charles Short, A Latin Dictionary