IPA: /nɒnˈdɪspəˌsɪv/
KK: /nɑnˈdɪspərsɪv/
Not able to spread out or scatter; remaining concentrated in one place.
The nondispersive material was used to ensure that the light remained focused.
Nondispersive → It is formed from "non-" (meaning not) and "dispersive" (from Latin "dispersus", meaning scattered). The word "nondispersive" means not having the quality of scattering or spreading out.
Think of 'non-' meaning not, and 'dispersive' relating to scattering. This helps you remember that 'nondispersive' refers to something that does not scatter.