Residential Mortgage-Backed Security (RMBS) A type of security whose cash flows come from residential debt such as mortgages, home-equity loans and subprime mortgages. This is a type of mortgage-backed securities that focuses on residential instead of commercial debt. Investopedia Says: Holders of an RMBS receive interest and principal payments that come from the holders of the residential debt. The RMBS comprises a large amount of pooled residential mortgages. Related Terms: Commercial Mortgage-Backed Securities - CMBS Home-Equity Loan Interest Mortgage Mortgage-Backed Securities - MBS Principal Subprime Loan Vintage |