UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈmjuːkəs/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈmjukəs/ ,USA pronunciation: respelling(myo̅o̅kəs)

WordReference Random House Learner's Dictionary of American English © 2020
mu•cus /ˈmyukəs/USA pronunciation   n. [uncountable]
  1. Biochemistrya watery, slippery substance produced in the body and that serves to protect and lubricate certain surfaces:mucus in his nose.

WordReference Random House Unabridged Dictionary of American English © 2020
mu•cus  (myo̅o̅kəs),USA pronunciation n. 
  1. Physiologya viscous, slimy mixture of mucins, water, electrolytes, epithelial cells, and leukocytes that is secreted by glands lining the nasal, esophageal, and other body cavities and serves primarily to protect and lubricate surfaces.
  • Latin mūcus snot; akin to Greek mykté̄r nose, mýxa slime
  • 1655–65

Collins Concise English Dictionary © HarperCollins Publishers::
mucus /ˈmjuːkəs/ n
  1. the slimy protective secretion of the mucous membranes, consisting mainly of mucin
Etymology: 17th Century: from Latin: nasal secretions; compare mungere to blow the nose; related to Greek muxa mucus, muktēr nose

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