Lewis Short
(adjective) : undŭlātus, a, um, undo, I. B. 2. and II. p. a.
* Diversified as with waves (like watered stuffs), undulated: togae, Varr. ap. Non. 189, 26 (cited also in Plin. 8, 48, 74, § 195).
Charlton T. Lewis, Charles Short, A Latin Dictionary