What is Bank Bill?

Legal Definition
A promissory note issued by a bank, payable to the hearer on demand, and designed to circulate as money. Townsend v. People, 4 111. 328; Low r. People, 2 Park. Cr. R. (N. Y.) 37, State v. Hays, 21 Ind. 176; State v. Wilkins, 17 Vt. 155.
-- Black's Law Dictionary
Legal Definition
A bill given by banks that are discounted lower than trade bills.
Legal Definition
Demand notes of a bank payable to bearer.
-- Ballentine's Law Dictionary