1) Moving in undulations 
• (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.
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. ... <optics> Undulatory theory, or Wave theory (of light), that theory which regards its various phenomena as due to undulations in an ...
undulant adjective resembling waves in form or outline or motion
moving in undulations. · having the form or appearance of waves.