ˈ ̷ ̷ ˌ ̷ ̷ ̷ ̷ ˈ ̷ ̷ ̷ ̷ - noun
: a protease that is secreted by the epithelial cells of the prostate and is used in the diagnosis of prostate cancer since its concentration in the blood serum tends to be proportional to the clinical stage of the disease — abbreviation PSA