'Coal-black' definitions:

Definition of 'coal-black'

(from WordNet)
adjective
Of the blackest black; similar to the color of jet or coal [syn: coal-black, jet, jet-black, pitchy, sooty]

Definition of 'Coal-black'

From: GCIDE
  • Coal-black \Coal"-black`\ (-bl[a^]k`), a. As black as coal; jet black; very black. --Dryden. [1913 Webster]