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 To our distress, the label informs us that the figurine rests atop a vial that contains the ailing artist’s blood and mucus. Doug Maccash,, "New Ogden museum exhibit captures the dreadful 2020 gestalt with bullets, blood and tears," 8 Sep. 2020 Occasionally, they get clogged with mucus and need to be taken offline. Scott Patterson, WSJ, "Labs Struggled With Surge in Covid-Testing Demand; How One Made It Through," 6 Sep. 2020 The idea of placing a shared beauty product near one’s facial mucus membranes rattles physicians. Washington Post, "To sample is human. But our beloved lipstick testers and cheese cubes aren’t coming back anytime soon.," 31 Aug. 2020 The process is sort of similar to how a spider builds its web, but unlike with a spiderweb, these mucus houses are secreted all at once. Alex Fox, Smithsonian Magazine, "Scientists Tour Elaborate, Deep-Sea ‘Snot Palaces’ for the First Time," 9 June 2020 Sure enough, the cervical mucus of the females had stronger effect on the sperm of some males than others, the study found. Sandee Lamotte, CNN, "A woman's reproductive tract can weed out unwanted sperm after sex, studies find," 18 Aug. 2020 The mucus coats the eye’s surface and helps to bind the film to the eye, the water is a natural saline solution containing crucial proteins and minerals, and the oil prevents the eye from drying out. Virginia Morell, National Geographic, "‘Crocodile tears’ are surprisingly similar to our own," 13 Aug. 2020 The cilia allow the entire cassiosome to gyrate and spiral within the mucus. Hannah Knighton, Smithsonian Magazine, "These Jellyfish Don’t Need Tentacles to Deliver a Toxic Sting," 13 Feb. 2020 Dermoids, which are cysts that can have hair, bones, teeth, or skin. Cystadenomas, which show up on the surface of the ovary and can be filled with a watery or mucus-based fluid, according to the Mayo Clinic. Korin Miller, SELF, "9 Signs You're Dealing With a Ruptured Ovarian Cyst," 18 Aug. 2020

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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Time Traveler for mucus

Time Traveler

The first known use of mucus was in 1597

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Statistics for mucus

Last Updated

18 Sep 2020

Cite this Entry

“Mucus.” Dictionary, Merriam-Webster, Accessed 24 Sep. 2020.

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More Definitions for mucus


How to pronounce mucus (audio)

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

Nglish: Translation of mucus for Spanish Speakers

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

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