Informal Federal National Mortgage Association: a government-sponsored corporation, formerly a federal agency, which purchases mortgages from lending institutions and issues mortgage-backed certificates and long-term bonds
See Fannie Mae in American Heritage Dictionary 4
noun
A security issued by the Federal National Mortgage Association and secured by a pool of federally insured and conventional mortgages.
Origin:
Origin: Alteration of F(ederal) N(ational) M(ortgage) A(ssociation)