tremulant /ˈtɹɛmjʊlənt/adjective 1noun 1forms 3 adjective1 •Trembling, tremulous.Lightning exploded through the sky, followed quickly by a tremulant clap of thunder. — 2009 noun1 •A mechanical component of a musical organ, designed to add vibration to the sounds produced by the instrument.The tremulant is a small apparatus that gives to the tone of any department of an organ to which it may be applied a waving or undulating effect. — 1855 formstremulants · more tremulant · most tremulant