Foreign bank. A bank organized under foreign law, or an agency, branch or office located outside the United States of a bank. The term does not include an agent, agency, branch or office within the United States of a bank organized under foreign law.
31 CFR § 1010.100
When used in this chapter and in forms prescribed under this chapter, where not otherwise distinctly expressed or manifestly incompatible with the intent thereof, terms shall have the meanings ascribed in this subpart. Terms applicable to a particular type of financial institution or specific part or subpart of this chapter are located in that part or subpart. Terms may have different meanings in different parts or subparts.