Definition of infectiousnext
as in spreading
exciting a similar feeling or reaction in others an infectious giggle that got the whole class laughing

Synonyms & Similar Words

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Example Sentences

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.
Recent Examples of infectious And Bell said this would meet the intent of the quarantine order, which was to ensure that the public is not exposed to someone who may be infectious. Deidre McPhillips, CNN Money, 16 June 2026 The organization has also partnered with NHS hospitals in Sussex to help recycle non-infectious clinical waste into training equipment, a scheme which is now going to be expanded across other hospitals. K.j. Yossman, Variety, 16 June 2026 What else is going on A person with an infectious case of the measles likely visited San Francisco International Airport, a Bay Area county has warned. Kevinisha Walker, Los Angeles Times, 15 June 2026 Here are some tips from infectious-disease and public-health experts about what to worry about, what not to worry about, and how to best protect yourself. Alice Park, Time, 12 June 2026 See All Example Sentences for infectious
Recent Examples of Synonyms for infectious
catching
Adjective
  • Christian Vázquez, who replaced Diaz in the lineup Monday, figures to take on primary catching duties while Diaz is out.
    Matt Kawahara, Houston Chronicle, 4 May 2026
  • The Braves gained four years and millions of dollars by substituting Olson for Freeman at first base – even though one of those traded was slugging catching prospect Shea Langeliers.
    Dan Schlossberg, Forbes.com, 15 Apr. 2026

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Cite this Entry

“Infectious.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/infectious. Accessed 26 Jun. 2026.

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