What is Annuities Of Tiends?

Legal Definition
In Scotch law. Annuities of tithes; 10s. out of the boll of tiend wheat, 8s. out of the boll of beer, less out of the boll of rye, oats, and peas, allowed to the crown yearly of the tiends not paid to the bishops or set apart for other pious uses.
-- Black's Law Dictionary
Legal Definition
Annuities of titles.
-- Ballentine's Law Dictionary