[ myoo-kuh s ]
/ ˈmyu kəs /


pertaining to, consisting of, or resembling mucus.
containing or secreting mucus.

Origin of mucous

1640–50; < Latin mūcōsus slimy, mucous, equivalent to mūc(us) snot (see mucus) + -ōsus -ous

Related forms

mu·cos·i·ty [myoo-kos-i-tee] /myuˈkɒs ɪ ti/, nounnon·mu·cous, adjectivesub·mu·cous, adjective

Can be confused

mucous mucus Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mucous

British Dictionary definitions for mucous


mucose (ˈmjuːkəʊs, -kəʊz)

/ (ˈmjuːkəs) /


of, resembling, or secreting mucus

Derived Forms

mucosity (mjuːˈkɒsɪtɪ), noun

Word Origin for mucous

C17: from Latin mūcōsus slimy, from mucus


The noun mucus is often misspelled mucous . Mucous can only be correctly used as an adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for mucous


[ myōōkəs ]


Containing, producing, or secreting mucus.
Relating to, consisting of, or resembling mucus.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.