The Collaborative International Dictionary of English v.0.48:

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.
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         Breath vocalized, that is, vibrated and undulated.
                                                  --Holder.
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The Collaborative International Dictionary of English v.0.48:

Undulated \Un"du*la`ted\, a.
   1. Resembling, or in the nature of, waves; having a wavy
      surface; undulatory.
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   2. (Bot.) Waved obtusely up and down, near the margin, as a
      leaf or corolla; wavy.
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   3. (Zool.) Formed with elevations and depressions resembling
      waves; having wavelike color markings; as, an undulated
      shell.
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