/suy'toh meg'euh loh vuy"reuhs/ , n. , pl. cytomegaloviruses .
a common virus of the herpesvirus family, usually harmless or causing mild colds but capable of producing severe systemic damage in infected newborns and immunosuppressed persons. Abbr.: CMV
[ 1960-65; cytomegal ( ia ) (see CYTOMEGALIC) + -O- + VIRUS ]