trem·o·lant I. \ˈtremələnt\noun alsotrem·u·lant\-myəl-\ (-s) Etymology: Italian tremolante tremolo stop, from tremolante tremulous, from Medieval Latin tremulant-, tremulans, present participle of tremulare to tremble 1.: an organ pipe having a tremolant note 2.: a device to impart a vibration causing a tremolant sound in a musical instrument II. adjective : having a vibrant tremolo note