Definition of improvisatore in US English:

improvisatore

(also improvvisatore)

noun

  • A poet who composes or performs verse extemporaneously.

Origin

Mid 18th century; earliest use found in Tobias Smollett (1721–1771), writer. From Italian improvvisatore, † improvisatore poet who composes or performs verse extemporaneously from improvvisare + -atore.