counterfoil

[koun-ter-foil] /ˈkaʊn tərˌfɔɪl/
noun, Chiefly British
1.
a part of a bank check, money order, etc., that is kept by the issuer and on which a record of the transaction is made; stub.
Origin
1700-10; counter- + foil2
British Dictionary definitions for counterfoil

counterfoil

/ˈkaʊntəˌfɔɪl/
noun
1.
(Brit) the part of a cheque, postal order, receipt, etc, detached and retained as a record of the transaction Also called (esp US and Canadian) stub