Learn That Word

Synonyms for PSA (same or very similar meaning)

WordNet sense 1 (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):
prostate specific antigen

From the ODE community, based on WordNetadd/edit