Definition of "undulate"

undulate

/ˈʌndjəleɪt/

verb
third-person singular simple present undulates, present participle undulating, simple past and past participle undulated
1. (transitive) To cause to move in a wavelike motion.
  Quotations
  Breath vocalized, i.e., vibrated and undulated.
  1669, William Holder, Elements of Speech: An Essay of Inquiry into the Natural Production of Letters: […], London: […] T. N[ewcomb] for J[ohn] Martyn printer to the R[oyal] Society, […]
2. (transitive) To cause to resemble a wave.
3. (intransitive) To move in wavelike motions.
4. (intransitive) To appear wavelike.
adjective
comparative more undulate, superlative most undulate
1. Wavy in appearance or form.
2. Changing the pitch and volume of one's voice.
3. (botany, of a margin) sinuous, winding up and down.