: 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
All that human saliva and mucus, absorbed and dried into a rough crust.
—
Literary Hub, 4 Mar. 2026
Typically, Gunnar had to keep his time on the ice short due to his difficulty breathing, often coughing up mucus when returning from his shift.
—Ian Thomas, CNBC, 4 Mar. 2026
To manage the disorder, people with cystic fibrosis can do a variety of daily therapies with the goal of loosening mucus from the lungs, preventing infection and treating intestinal blockages.
—Lawrence Mower, Miami Herald, 27 Feb. 2026
Her nose clogged with thick mucus.
—Mike Hixenbaugh, NBC news, 27 Feb. 2026
See All Example Sentences for mucus
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.
Literary Hub, 4 Mar. 2026
Typically, Gunnar had to keep his time on the ice short due to his difficulty breathing, often coughing up mucus when returning from his shift.
—Ian Thomas, CNBC, 4 Mar. 2026
To manage the disorder, people with cystic fibrosis can do a variety of daily therapies with the goal of loosening mucus from the lungs, preventing infection and treating intestinal blockages.
—Lawrence Mower, Miami Herald, 27 Feb. 2026
Her nose clogged with thick mucus.
—Mike Hixenbaugh, NBC news, 27 Feb. 2026
See All Example Sentences for mucus
Cite this Entry
“Mucus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mucus. Accessed 10 Mar. 2026.
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
Love words? Need even more definitions?
Merriam-Webster unabridged
