traveler's letter of credit: a letter of credit given to a traveler
letter of credit: a document issued by a bank that guarantees the payment of a customer's draft; substitutes the bank's credit for the customer's credit
rutherford atom: first modern concept of atomic structure; all of the positive charge and most of the mass of the atom are contained in a compact nucleus; a number of electrons (equal to the atomic number) occupy the rest of the volume of the atom and neutralize the positive charge