Definition: undulate

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Source: WordNet (r) 1.7 

undulate
     adj : having a sinuate margin and rippled surface
     v 1: stir up (water) so as to form ripples [syn: ripple, ruffle,
           riffle, cockle]
     2: occur in soft rounded shapes; "The hills rolled past" [syn:
        roll]
     3: move in a wavy pattern, as of curtains [syn: flap, wave]

Source: Webster's Revised Unabridged Dictionary (1913) 

Undulate \Un"du*late\, v. i.
   To move in, or have, undulations or waves; to vibrate; to
   wave; as, undulating air.
Undulate \Un"du*late\, a. [L. undulatus undulated, wavy, a dim.
   from unda a wave; cf. AS. ??, Icel. unnr; perhaps akin to E.
   water. Cf. Abound, Inundate, Redound, Surround.]
   Same as Undulated.
Undulate \Un"du*late\, 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.

         Breath vocalized, that is, vibrated and undulated.
                                                  --Holder.