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.
Doctors and public health experts said that the hepatitis B shot is currently recommended for all babies at birth because the risk if a baby is missed is too high. Dr. Jade Cobern, ABC News, 18 Sep. 2025 The panel, called the Advisory Committee on Immunization Practices, or ACIP, is scheduled to vote on recommendations for Covid jabs and childhood immunizations for hepatitis B and measles, mumps, rubella, and varicella, or MMRV. Annika Kim Constantino, CNBC, 18 Sep. 2025 The hepatitis B vaccine has been credited with saving tens of thousands of lives since physicians began administering it at birth more than 30 years ago. Nathaniel Weixel, The Hill, 17 Sep. 2025 Cassidy, who is not only a doctor but also a hepatologist, spoke passionately about the importance of birth doses of the hepatitis B vaccine. Beth Mole, ArsTechnica, 17 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 21 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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