undulate

a. [ L. undulatus undulated, wavy, a dim. from unda a wave; cf. AS. &unr_;&unr_;, Icel. unnr; perhaps akin to E. water. Cf. Abound, Inundate, Redound, Surround. ] Same as Undulated. [ 1913 Webster ]

v. t. [ imp. & p. p. Undulated p. pr. & vb. n. Undulating. ] To cause to move backward and forward, or up and down, in undulations or waves; to cause to vibrate. [ 1913 Webster ]

Breath vocalized, that is, vibrated and undulated. Holder. [ 1913 Webster ]

v. i. To move in, or have, undulations or waves; to vibrate; to wave; as, undulating air. [ 1913 Webster ]