An Old English enemy, foe, and Devil noun inherited from the Germanic lexicalized present-participial formation *fi(j)and-. OED’s revised 2026 entry treats fēond and fīond as dialectal Old English forms, documents i-mutated fīend and fȳnd inside the inherited nd-stem inflection, and traces the word through a highly variable Middle English record into modern fiend. Bosworth–Toller supplies the Old English paradigm and examples; the Middle English Dictionary independently reports 188 quotations across eight senses. Cotton MS Vitellius A XV folio 180v was directly inspected at Beowulf 2289, where feondes modifies fotlast, the foe’s footprint.