Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
gray-haired is an adjective meaning "showing characteristics of age, especially having grey or white hair". It carries one recorded sense.
showing characteristics of age, especially having grey or white hair
“whose beard with age is hoar”
“nodded his hoary head”
Definitions, synonyms and semantic relations for gray-haired come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.