Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

mucus

play
noun mu·cus \ˈmyü-kəs\

Simple Definition of mucus

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

Source: Merriam-Webster's Learner's Dictionary

Full Definition of mucus

  1. :  a viscid slippery secretion that is usually rich in mucins and is produced by mucous membranes which it moistens and protects

Origin and Etymology of mucus

Latin, nasal mucus; akin to Greek myxa mucus


First Known Use: 1597


MUCUS Defined for Kids

mucus

play
noun mu·cus \ˈmyü-kəs\

Definition of mucus for Students

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




Medical Dictionary

mucus

play
noun mu·cus \ˈmyü-kəs\

Medical Definition of mucus

  1. :  a viscid slippery secretion that is usually rich in mucins and is produced by mucous membranes which it moistens and protects




Learn More about mucus


Seen and Heard

What made you want to look up mucus? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to proceed clumsily or ineffectually

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

lavender-fields-in-france

Which of these is a synonym of caesura?

megillah rebellion interruption torrent
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ