undulatory

English

Etymology

undulate +‎ -ory

Adjective

undulatory (comparative more undulatory, superlative most undulatory)

1. That undulates, or that causes undulations
   • 1906, James George Frazer, Adonis, Attis, Osiris, volume 2, page 146:

     His body was contracted and bent towards them, and described an undulatory movement like that of a worm writhing.