acyclovir definition
acyclovir in Medicine. acyclovir aÂ·cyÂ·cloÂ·vir (Ä-sÄ«'klÅ-vÇr, -klÉ-) n. A synthetic purine nucleoside analog that is derived from guanine and is used topically in the treatment of herpes simplex infections, especially those of the genitals. Also called acycloguanosine.