'Dispersive power' definitions:

Definition of 'Dispersive power'

From: GCIDE

Dispersive \Dis*pers"ive\, a. Tending to disperse. [1913 Webster]
Dispersive power (Opt.), the relative effect of a material in separating the different rays of light by refraction, as when the substance is formed into a prism. -- {Dis*pers"ive*ness}, n. [1913 Webster]