fi·nas·ter·ide 
(fə-năstə-rīd′)
(fə-năstə-rīd′)n.
A synthetic androgen inhibitor used primarily in men for the treatment of benign prostatic hyperplasia and androgenetic alopecia.
[fin- (alteration of (al)ph(a-reductase) in(hibitor)) + (az)aster(oid), steroid containing azine (alteration of AZO- + STEROID) + (AM)IDE.]