con·tra·ges·tive  (kŏn'trə-jěs'tĭv)  adj. Capable of preventing gestation, either by preventing implantation or by causing the uterine lining to shed after implantation. n. A contragestive drug or agent. [contra- + gest(ation) + -ive.] con'tra·ges·ta'tion (-jě-stā'shən) |