What is Staple?

Legal Definition
Intern. law. The right of staple as exercised by a people upon foreign merchants, is defined to be, that they may not allow them to set their merchandises and wares to sale but in a certain place.

2. This practice is not in use in the United States. 1 Chit. Com. Law, 103; 4 Inst. 238; Malone, Lex Mere. 237; Bac. Ab. Execution, B 1. Vide Statute Staple.
-- Bouviers Law Dictionary
Legal Definition
In English law. A mart or market. A place where the buying and selling of wool, lead, leather, and other articles were put under certain terms. 2 Rceve, Eng. Law, 393. In international law. The right of staple, as exercised by a people upon foreign merchants, is defined to be that they may not allow them to set their merchandises and wares to sale but in a certain place. This practice is not in use in the United States. 1 Chit. Com. Law, 103.
See also
-- Black's Law Dictionary
Legal Definition
-- Ballentine's Law Dictionary