Swefel-réc
Bosworth & Toller Anglo-Saxon Old English Dictionary - swefel-réc
According to the Old English Dictionary:
es;
- swefel-réc
- m. Sulphur-smoke, the smoke from burning sulphur :-- Ríneþ ofer ða synfullan swefelréc pluet super peccatores sulphur, Ps. Surt. 10, 7. Cf. swefel-þrosm. swefel-rec