Note 396 — Chapter VI · THE PROTO-SIDERIC OR EARLY IRON AGE OF WEAPONS.
Reading edition
The lump of iron worked into a mass more or less rectangular is called a bloom, from the Saxon bloma, metal in mass (Bosworth): Bloma ferri occurs in the Domesday Book. Hence ancient furnaces were called bloomeries; the Elizabethan spelling is a bloomary. The blooms were beaten out to bars.