Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
coal-black is an adjective meaning "of the blackest black; similar to the color of jet or coal". It carries one recorded sense.
of the blackest black; similar to the color of jet or coal
Definitions, synonyms and semantic relations for coal-black come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.