Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
stone-gray is an adjective meaning "of the color of slate or granite". It carries one recorded sense.
of the color of slate or granite
“the slaty sky of dawn”
Definitions, synonyms and semantic relations for stone-gray come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.