Lewis Short
nūbĭgĕna (noun Comm) : nubes-gigno
* Cloud-born, born of clouds or of a cloud (poet.).
* In gen.: amnes,Stat. Th. 1, 365: nimbi,Prud. Hamart. 486: clipei, the Ancilia (so called because they fell from the sky), Stat. S. 5, 2, 131.
* In partic.
* The Centaurs, whom Ixion begot of a cloud, Stat. Th. 5, 263; Ov. M. 12, 211; 541; cf. Hyg. Fab. 62.
* Phrixus, as the son of Nephele: Phrixus nubigena, Col. poët. 10, 115.
Charlton T. Lewis, Charles Short, A Latin Dictionary