variants: or coomb \ ˈküm \
plural -s

Definition of coom

 (Entry 1 of 2)

1 dialectal, British
a : soot, smut
b : coal dust or coal slack
2 : grease exuding from axle boxes or bearings
variants: or coomb \ " \
plural -s

Definition of coom (Entry 2 of 2)

Scottish
: the wooden centering or frame on which a masonry arch is built

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for coom

Noun (1)

Middle English culme

Noun (2)

origin unknown

Keep scrolling for more

Learn More about coom

Statistics for coom

Cite this Entry

“Coom.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/coom. Accessed 29 Oct. 2020.

Comments on coom

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

WORD OF THE DAY

Test Your Vocabulary

Here Be Dragons: A Creature Identification Quiz

  • monster werewolf photo
  • Which is a synonym of werewolf?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

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

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!