1677 E. Browne Trav. Germany, etc. 161Baths..esteemed to be Sulphureo-nitrous. 
1693 Phil. Trans. XVII. 1004A Sulphureo-saline Spring. 
1731 Miller Gard. Dict. Y yyy,These sulphureo-aërial Particles in the Leaves. 
1754 Phil. Trans. XLVIII. 853The sulphureo-reguline substance. 
1871 W. A. Leighton Lichen-flora 46C furfuracea, Ach. sulphureous or sulphureo-virescent, apothecia sulphureo-suffused, or with flavo-virescent, naked, elongate stipites. [ oniocybe] 
ORIGIN: from Latin  sulphureus : see sulphureous -o-