Libra arsa
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
A burned or tested pound.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A pound burned ; that is, melted, or assayed by melting, to test its purity. Libras arias et pensatas, pounds burned and weighed. A frequent expression in Domesday, to denote the purer coin in which rents were paid. Spelman; Cowell.
Defined under Libra in Black's Law Dictionary.