As used in sections 4-53 to 4-55, inclusive, trustee account means any account operated in any state educational institution or welfare or medical agency for the benefit of the employees or students of such institution or agency, including so-called clients’ funds in state hospitals, the revenue of which is derived from the operation of canteens, vending machines, dramatics, recitals, student activity fees, membership fees, deposits, gifts, donations, bequests or any other legal source compatible with the good government of such institution or agency.