norovirus

noun

nor·​o·​virus ˈnȯr-ə-ˌvī-rəs 

: any of a genus (Norovirus) of small, round, single-stranded RNA viruses that includes a single species (species Norwalk virus) with various strains causing gastroenteritis in people and animals (such as cows, pigs, and dogs)

People spread the virus by eating food or drinking liquids that are contaminated with norovirus, touching surfaces or objects contaminated with norovirus and then touching their mouth or having direct contact with another person who is infected.

—Cherie Black

Note: In people, noroviruses cause gastroenteritis marked chiefly by sudden onset diarrhea, vomiting, nausea, and abdominal cramps.

see norwalk virus

Examples of norovirus in a Sentence

Recent Examples on the Web

In previous years, the U.S. usually saw norovirus outbreaks increase around December. —Nicole Brown Chau, CBS News, 3 June 2025

Why cruise ships are battling a so many norovirus outbreaks Fifty-five of the 1,149 guests aboard the line’s Zuiderdam ship also got sick during its current cruise, in addition to 14 crew, with their main symptom being diarrhea. —Nathan Diller, USA Today, 29 Apr. 2025

Dozens of Hikers Fall Ill with Norovirus, Force Temporary Closure of Popular Hawaii Hiking Trail Earlier this month, over 200 passengers and 17 crew aboard a Cunard Line ship reported being ill following a norovirus outbreak. —Kimberlee Speakman, People.com, 23 Apr. 2025

On average, some 19-21 million instances of norovirus illness occur in the US every year, according to the CDC. —Francesca Street, CNN Money, 2 Apr. 2025

Word History

Etymology

New Latin, from English Norwalk virus + New Latin -o- + virus

First Known Use

2002, in the meaning defined above

Rhymes for norovirus

• antivirus
• herpesvirus
• parvovirus
• reovirus
• retrovirus
• rhinovirus
• rotavirus
• adenovirus
• baculovirus
• coronavirus
• enterovirus
• poliovirus

Medical Definition

norovirus

noun

nor·​o·​virus ˌnȯr-ō-ˈvī-rəs 

1

capitalized : a genus of small, round, single-stranded, highly infectious RNA viruses that includes a single species (species Norwalk virus) with various strains causing gastroenteritis in people and animals (such as cows and dogs)

2

: any virus of the genus Norovirus

People spread the virus by eating food or drinking liquids that are contaminated with norovirus, touching surfaces or objects contaminated with norovirus and then touching their mouth or having direct contact with another person who is infected.

—Cherie Black, The Seattle Post-Intelligencer

Note: In people, noroviruses cause gastroenteritis marked chiefly by sudden onset, diarrhea, vomiting, nausea, and abdominal cramps.

see norwalk virus