2. Adjective. (US banking) ''(now worldwide)'' Designating a loan (typically at a greater than usual rate of interest) offered to a borrower who is not qualified for other loans (e.g. because of poor credit history). ¹
3. Adjective. (US banking) (dated) Designating a type of commercial lending rate, less than the prime rate, offered to desirable borrowers. ¹
4. Noun. A subprime loan. ¹
¹ Source: wiktionary.com