Fýr-bæþ

According to the Old English Dictionary:

fýr-bæþ

gen. -bæðes, -baðes; n. A fire-bath; igneum balneum :-- On fýrbæðe in the fire-bath, Elen. Kmbl. 1895; El. 949. In fýrbaðe in the fire-bath, Exon. 20 a; Th. 52, 10; Cri. 831 : 22 b; Th. 61, 18; 986. fyr-bæþ