Etymology
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coal-black (adj.)

"black as coal," mid-13c., from coal (n.) + black (adj.).

updated on January 03, 2018

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Definitions of coal-black from WordNet

coal-black (adj.)
of the blackest black; similar to the color of jet or coal;
Synonyms: jet / jet-black / pitchy / sooty
From wordnet.princeton.edu, not affiliated with etymonline.