ˌsīd.ə¦megəlō¦vīrəs noun
Etymology: New Latin, from English cytomegal ic (herein) + New Latin -o- + virus
: a herpesvirus (genus Cytomegalovirus ) that causes cellular enlargement and formation of eosinophilic inclusion bodies especially in the nucleus and that acts as an opportunistic infectious agent in immunocompromised conditions (as AIDS)