chicken pox UK /ˈt͡ʃɪ.k(ə)nˌpɒks/US /ˈt͡ʃɪ.k(ə)nˌpɑks/ noun3 •The highly contagious airborne disease caused by initial infection with varicella zoster virus, typically causing a skin rash that forms small itchy blisters. •(nonstandard) Any disease causing similar symptoms. •(no longer used) The blisters formed by the varicella zoster virus (VZV). formschicken poxes