Named after Norwalk, Ohio, where an outbreak of gastroenteritis in 1968 led to the isolation of the virus.
- (medicine, virology) Designating a calicivirus affecting humans, characterized by severe vomiting and diarrhea.
- A city in southwestern Connecticut
- A river in Connecticut
- A city in Iowa
- A city in Ohio, and county seat of Huron County.
- A village in Wisconsin