pris·mat·ic 
(prĭz-mătĭk) also pris·mat·i·cal (-ĭ-kəl)
(prĭz-mătĭk) also pris·mat·i·cal (-ĭ-kəl)adj.
1. Of, relating to, resembling, or being a prism.
2. Formed by refraction of light through a prism. Used of a spectrum of light.
3. Brilliantly colored; iridescent.
[Greek prīsma, prīsmat-, prism; see PRISM + -IC.]
pris·mati·cal·ly adv.