coom

1 of 2

noun (1)

variants or coomb

ˈküm 

plural -s

1

dialectal, British

a

: soot, smut

b

: coal dust or coal slack

2

: grease exuding from axle boxes or bearings

coom

2 of 2

noun (2)

variants or coomb

" 

plural -s

Scottish

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

Word History

Etymology

Noun (1)

Middle English culme

Noun (2)

origin unknown

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!