undulate
Concise Oxford English Dictionary © 2008 Oxford University Press:
undulate
▶verb /ˈʌndjʊleɪt/ move with a smooth wave-like motion.
■ (usu. as adj. undulating) have a wavy form or outline.
▶adjective /ˈʌndjʊlət/ Botany & Zoology having a wavy surface or edge.– derivatives
undulately adverb,
undulation noun,
undulatory adjective.
undulately adverb,
undulation noun,
undulatory adjective.
– origin C17: from late L. undulatus, from L. unda ‘a wave’.
'undulate' also found in these Oxford entries:

