Undulatory a. : Moving in the manner of undulations, or waves; resembling the motion of waves, which successively rise or swell rise or swell and fall; pertaining to a propagated alternating motion, similar to that of waves.

Example:
what's a simple way to describe "anguilliform" Undulatory movement of lampreys? and what's ondullatory mean?

Taxonomy
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Defination from the web:
undulatory in the Online Dictionary. Meaning of undulatory. Pronunciation of undulatory. Translations of undulatory. undulatory synonyms, undulatory antonyms. ... undulatory theory. wave theory. wave theory of light ...