ImprovisoIm`pro*vi"so\, a. [L. improvisus unforeseen; cf. It. improvviso.] Not prepared or mediated beforehand; extemporaneous. [Obs.] --Jonhson.
|a scrap or morsel of food left at a meal.|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|