pol·y I:C 
(pŏlē īsē)
(pŏlē īsē)n.
A synthetic polymer of inosine and cytidine that resembles the double-stranded RNA of infectious viruses and is used experimentally to stimulate the immune system.
[POLY- + I(NOSINIC ACID) + c(ytidylic acid) (CYTID(INE) + -YL + -IC).]