The Collaborative International Dictionary of English v.0.48:

FHLMC \FHLMC\ n. [acronym from Federal Home Loan Mortgage
   Corporation.]
   a corporation authorized by Congress to provide a secondary
   market for residential mortgages. It is called Freddie Mac
   in the jargon of the finance industry. [acronym]

   Syn: Federal Home Loan Mortgage Corporation, Freddie Mac.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Freddie Mac
    n 1: a corporation authorized by Congress to provide a secondary
         market for residential mortgages [syn: Federal Home Loan
         Mortgage Corporation, Freddie Mac, FHLMC]