: 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
Even without actual mucus, suction cups with a water seal have been found to hang onto things 55 times longer than those without.
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ArsTechnica, 28 June 2025
This may look like blobs of mucus in the toilet or jelly-like strands of mucus on the stool.
—Sherri Gordon, Health, 21 June 2025
Drinking enough water can help thin mucus and ease breathing.
—Emily Brown, Verywell Health, 14 May 2025
Some infections that cause brown mucus include:6 Bacterial bronchitis: This bacterial lung infection causes brown or yellow-green mucus.
—Mark Gurarie, Health, 15 June 2025
See All Example Sentences for mucus
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ArsTechnica, 28 June 2025
This may look like blobs of mucus in the toilet or jelly-like strands of mucus on the stool.
—Sherri Gordon, Health, 21 June 2025
Drinking enough water can help thin mucus and ease breathing.
—Emily Brown, Verywell Health, 14 May 2025
Some infections that cause brown mucus include:6 Bacterial bronchitis: This bacterial lung infection causes brown or yellow-green mucus.
—Mark Gurarie, Health, 15 June 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 8 Jul. 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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