The story
- Latin · derived fromfervor“a boiling or raging heat, heat, vehemence, passion”
- Middle English · inherited fromfervour
- English todayfervor
From Middle English fervour, from Old French, from Latin fervor (“a boiling or raging heat, heat, vehemence, passion”), from fervere (“to boil, be hot”); see fervent. By surface analysis, Latin ferv- + -or (“abstract noun suffix”).
Etymology from Wiktionary, CC BY-SA 4.0.