Fǽr-cwealm

According to the Old English Dictionary:

es;

fǽr-cwealm

m. A sudden pestilence; repentīna pestĭlentia :-- Æt ðæm fǽrcwealme ðe his leódscipe swýðe drehte and wanode in the pestilence which much afflicted and decreased his people, L. Edg. S. 1; Th. i. 270, 8. fær-cwealm