Reditus nigri
Defined in 2 dictionaries — Ballentine's (1916), Black's (1910)
Ballentine's Law Dictionary
James A. Ballentine · 1916
Black rents, which see.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Black rent; black mail; rent payable in provisions, corn, labor, eta ; as distinguished from "money rent," called "reditus albi."
Defined under Reditus in Black's Law Dictionary.