The Collaborative International Dictionary of English v.0.48:

Prostate \Pros"tate\, a. [Gr. ? standing before, fr. ? to set
   before; ? before + ? to set: cf. F. prostate.] (Anat.)
   Standing before; -- applied to a gland which is found in the
   males of most mammals, and is situated at the neck of the
   bladder where this joins the urethra. -- n. The prostate
   gland.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prostate
    adj 1: relating to the prostate gland [syn: prostate,
           prostatic]
    n 1: a firm partly muscular chestnut sized gland in males at the
         neck of the urethra; produces a viscid secretion that is
         the fluid part of semen [syn: prostate gland, prostate]