im·provi·sa·tor \pronunc at improvisate+ə(r)\noun (-s) Etymology: French or Italian; French improvisateur, from Italian improvvisatore, from improvvisato (past participle of improvvisare) + -ore -or : improviser, improvisatore < he has been a great improvisator, and that his improvisation is not without merit is proved by his spectacular career — O.D.Tolischus >