Source : WordNet®

PSA
     n : a protein manufactured exclusively by the prostate gland;
         PSA is produced for the ejaculate where it liquifies the
         semen and allows sperm cells to swim freely; elevated
         levels of PSA in blood serum are associated with benign
         prostatic hyperplasia and prostate cancer [syn: {prostate
         specific antigen}]

Source : Free On-Line Dictionary of Computing

PSA
     
        Problem Statement Analizer.  See {PSL/PSA}.