Real Dictionary

echovirus in American English
any of a group of enteroviruses that includes viruses which cause mild forms of meningitis, gastroenteritis, etc., and others which appear to be asymptomatic
noun: any of numerous retroviruses of the picornavirus group, some harmless and others associated with various human disorders, as aseptic meningitis

echovirus in British English
noun: any of a group of viruses that can cause symptoms of mild meningitis, the common cold, or infections of the intestinal and respiratory tracts