sulfureous
adjective
sul·fu·re·ous
variants or sulphureous
¦səl¦fyu̇rēəs 
: consisting of sulfur : having the qualities of sulfur especially when burning : impregnated with sulfur : sulfur-colored : sulfurous
sulfureously adverb
sulfureousness noun
plural -es
Word History
Etymology
Latin sulfureus, sulphureus, from sulfur, sulphur, sulpur sulfur + -eus -eous