fȳr-wylm, m.n: a fire-boiling, raging flame. (FUHR-WULM / ˈfɝːɹ-ˌwɝlm)
Image from 12th-century Madrid Skylitzes manuscript, showing Romans using Greek fire against their enemies. Codex Skylitzes Matritensis, Bibliteca Nacional de Madrid, Vitr. 26-2, Bild-Nr. 77, f 34 v. b. From Wikimedia Commons.