A fixed cash fund or petty cash fund in the form of currency, a bank checking account, or both, maintained for expenditures that must be made in cash, and, from time to time, restored to its original amount by a transfer from general cash of a sum equal to the aggregate of disbursements; a form of working fund.
N.Y. Comp. Codes R. & Regs. Tit. 10 § 441.171