• (n.) One who composes and sings or recites rhymes and short poems extemporaneously.
Im`prov·vi`sa·to're noun ; plural Improvvisatori . [ Italian See Improvise .] One who composes and sings or recites rhymes and short poems extemporaneously. [ Written also improvisatore .]
an improvisator, esp. a person who extemporizes verse.