hepatitis B

noun

: an acute or chronic hepatitis that is caused by a DNA virus (species Hepatitis B virus of the genus Orthohepadnavirus, family Hepadnaviridae), is marked chiefly by fatigue, fever, nausea, vomiting, abdominal pain, darkened urine, jaundice, and joint pain but may be asymptomatic, and is transmitted especially by contact with infected blood (as by transfusion or by sharing contaminated needles in illicit intravenous drug use) or by contact with other infected bodily fluids (such as semen)

Note: The acute form of hepatitis B, a mild illness lasting several weeks to months, may progress to long-term or chronic infection often leading to liver damage, liver failure, or liver cancer.

called also serum hepatitis

Examples of hepatitis B in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The panel will debate recommendations for hepatitis B, COVID-19, and measles vaccines, and could vote on whether to modify the newborn hepatitis B policy. Heather Hunter, The Washington Examiner, 10 Sep. 2025 These include the diphtheria, tetanus and pertussis (DTaP) vaccine, the hepatitis B vaccine, Haemophilus influenzae type b (Hib) vaccine, polio vaccine, and measles, mumps and rubella (MMR) vaccine. ABC News, 10 Sep. 2025 At present, state rules require immunizations against measles, chickenpox, hepatitis B, polio and other diseases for childcare and public school attendance, according to the state's Department of Health's website. Peter Aitken, MSNBC Newsweek, 7 Sep. 2025 Three doses of the hepatitis B vaccine. Lily Altavena, Freep.com, 5 Sep. 2025 See All Example Sentences for hepatitis B

Word History

First Known Use

1971, in the meaning defined above

Time Traveler
The first known use of hepatitis B was in 1971

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Cite this Entry

“Hepatitis B.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hepatitis%20B. Accessed 14 Sep. 2025.

Medical Definition

hepatitis B

noun
: an acute or chronic hepatitis that is caused by a double-stranded DNA virus (species Hepatitis B virus of the genus Orthohepadnavirus, family Hepadnaviridae), is marked chiefly by fatigue, fever, nausea, vomiting, abdominal pain, darkened urine, jaundice, and joint pain but may be asymptomatic, and is transmitted especially by contact with infected blood (as by transfusion or by sharing contaminated needles in illicit intravenous drug use) or by contact with other infected body fluids (as semen)

Note: The acute form of hepatitis B, a mild illness lasting several weeks to months, may progress to long-term or chronic infection often leading to liver damage, liver failure, or liver cancer.

called also serum hepatitis

More from Merriam-Webster on hepatitis B

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