The word is only attested in this Anglo-Norman translation of Isaiah 1:22 and 1:25, and its meaning can be derived from the Biblical context. However, its etymology remains obscure.
s.
1metaldross, slag, waste obtained from metal in the process of smelting:
(
MS: s.xiv2
)
Ton argent est tournee en roisne (Latin: argentum tuum versum est in scoriam)(A) 219va
(
MS: s.xiv2
)
jeo [...] boilleroi ta roisne a purretee (Latin: excoquam ad purum scoriam tuam)(A) 219va
roisne (s.xiv2)