undulation - Wiktionary, the free dictionary undulation (countable and uncountable, plural undulations) But the next undulation would raise us, showing the island ablaze in the sunlight, an emerald of dazzling beauty resting lightly on the bosom of the sea A wavy appearance or outline; waviness (music) A tremulous tone produced by a peculiar pressure of the finger on a string
undulation - WordReference. com Dictionary of English (of a sound) to rise and fall in pitch:[no object] A siren undulated adj Also, ˈun•duˌlat•ed having a wavelike form or surface; wavy un•du•la•tion ˌʌndʒəˈleɪʃən, -dyə-, -də- n [uncountable] the sea's undulation [countable] the undulations of the dancer's hips