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