[bull's-eye] n, pl bull's-eyes (1825) 1: a very hard globular candy
2: a circular piece of glass with a lump in the middle formed at the end of a glassblower's pipe 3 a: the center of a target; also: something central or crucial b: a shot that hits the bull's-eye; broadly: something that precisely attains a desired end
4: a simple lens of short focal distance; also: a lantern with such a lens