/ek"oh vuy'reuhs/ , n. , pl. echoviruses .
any of numerous retroviruses of the picornavirus group, some harmless and others associated with various human disorders, as aseptic meningitis.
Also, echo virus, ECHO virus .
[ 1950-55; echo- (acronym from enteric cytopathogenic human orphan ) + VIRUS; orig. termed "orphan" because they were not known to be the cause of any disease ]