mu·​cus | \ ˈmyü-kəs How to pronounce mucus (audio) \

Definition of mucus

: 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

According to the lawsuit, nurses failed to provide the newborn with basic postdelivery medical care: The baby was not warmed after delivery, mucus was not cleared from his nose or mouth, and no clamps were available to sever the umbilical cord. Mariel Padilla,, "Woman gave birth in Denver jail cell alone, lawsuit says," 1 Sep. 2019 The lawsuit said that no nurse dried or warmed the baby or cleared mucus from his mouth for several minutes and that jail nurses did not have equipment to cut the baby's umbilical cord. CBS News, "Woman files lawsuit after giving birth alone in Denver jail cell," 29 Aug. 2019 My group texts are now peppered with earnest discussions of 10-step regimens, hyaluronic acid, and snail mucus face masks. Jacqueline Kantor, SELF, "How I Balance My Skin-Care Routine and My OCD Symptoms," 22 May 2019 Signs and symptoms may include diarrhea or more bowel movements than usual; stools that are black, tarry, sticky, or have blood or mucus; and severe stomach-area (abdomen) pain or tenderness. Astrazeneca, USA TODAY, "Tapping into the immune system shows promise in stage 3 lung cancer," 3 June 2019 The cryptobenthics eat microscopic stuff—filamentous algae, coral mucus, tiny crustaceans—and convert it to food for the hundreds of large fish species that define coral reefs in the minds of those who treasure them. Jennifer Hayes, National Geographic, "Coral reefs depend on lots of fish the size of jellybeans," 23 May 2019 Your body needs to dislodge that mucus plug from your cervix to deliver the baby, of course. Jessica Migala,, "5 Signs of Labor That Are Not False Alarms," 24 July 2019 This large amount of mucus helps these fish literally slip away from their predators. Nicola Di Girolamo, The Conversation, "What in the world is a slime eel?," 24 July 2019 Doctors told her parents that putting her in some kind of sport or activity would help the mucus in her body break down. Carmen Dipippo,, "Dancer with Cystic Fibrosis Competes in SYTYCD Academy Round: 'I'm Proud of Who I've Become'," 15 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'mucus.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of mucus

1597, in the meaning defined above

History and Etymology for mucus

borrowed from Latin mūcus, muccus "nasal discharge," perhaps going back to *moukos, o-grade derivative of Indo-European *(s)muk- "nasal discharge," *(s)meuk- "undo, loosen, wipe off" — more at myxo-

Note: See note at myxo-.

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Statistics for mucus

Last Updated

5 Sep 2019

Look-up Popularity

Time Traveler for mucus

The first known use of mucus was in 1597

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English Language Learners Definition of mucus

: a thick liquid that is produced in some parts of the body (such as the nose and throat)


mu·​cus | \ ˈmyü-kəs How to pronounce mucus (audio) \

Kids Definition of mucus

: a slippery thick sticky substance that coats, protects, and moistens the linings of body passages and spaces (as of the nose, lungs, and intestines)


mu·​cus | \ ˈmyü-kəs How to pronounce mucus (audio) \

Medical Definition of mucus

: 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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More from Merriam-Webster on mucus

Spanish Central: Translation of mucus

Nglish: Translation of mucus for Spanish Speakers

Britannica English: Translation of mucus for Arabic Speakers Encyclopedia article about mucus

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