: a viscid slippery secretion that is usually rich in mucins and is produced by mucous membranes which it moistens and protects
Examples of mucus in a Sentence
Recent Examples on the Web
Causes of Sneezing Sneezing is caused by the irritation of the mucus membranes in the nose or throat.
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Valerie Cacho, Verywell Health, 29 July 2025
This finding prompted their primary care physician to order tests for cystic fibrosis (CF), a genetic disorder that causes thick, sticky mucus to build up in the lungs, digestive system and other organs.
—Jordan Greene, People.com, 24 June 2025
These and more than 200 other viruses spread through saliva or mucus particles expelled from a sick person.
—Daryl Austin, USA Today, 12 June 2025
Patients develop fever, headache, weakness and pneumonia with shortness of breath, chest pain, cough and sometimes bloody or watery mucus.
—Saleen Martin, USA Today, 11 July 2025
See All Example Sentences for mucus
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Valerie Cacho, Verywell Health, 29 July 2025
This finding prompted their primary care physician to order tests for cystic fibrosis (CF), a genetic disorder that causes thick, sticky mucus to build up in the lungs, digestive system and other organs.
—Jordan Greene, People.com, 24 June 2025
These and more than 200 other viruses spread through saliva or mucus particles expelled from a sick person.
—Daryl Austin, USA Today, 12 June 2025
Patients develop fever, headache, weakness and pneumonia with shortness of breath, chest pain, cough and sometimes bloody or watery mucus.
—Saleen Martin, USA Today, 11 July 2025
See All Example Sentences for mucus
Cite this Entry
“Mucus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mucus. Accessed 5 Aug. 2025.
Copy CitationKids Definition
mucus
noun
mu·cus
ˈmyü-kəs 
: a slippery sticky substance produced especially by mucous membranes which it moistens and protects
Medical Definition
mucus
noun
mu·cus
ˈmyü-kəs
: a viscid slippery secretion that is usually rich in mucins and is produced by mucous membranes which it moistens and protects
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