cytomegalovirus /ˌsaɪ.toʊˈmɛ.ɡə.loʊˌvaɪ.rəs/ noun1 •Any of several herpes viruses, of the genus Cytomegalovirus, that infect the salivary glands of certain primates, including humans.The peak period for the development of acute graft-versus-host disease overlaps with the time during which cytomegalovirus infection occurs. — 1983 formscytomegaloviruses