Resembling or containing charcoal; dark, grayish, or black like charcoal; having the properties or appearance of charcoal.
From charcoal plus the adjectival suffix -y, forming a descriptive adjective meaning 'having the quality of charcoal'.
Adding '-y' to nouns is one of English's most productive patterns—we instantly understand 'charcoaly' even if we've never heard it before, showing how flexible our language grammar is.
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