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Capable of preventing gestation, either by preventing implantation or by causing the uterine lining to shed after implantation.
A contragestive drug or agent.
con′tra·ges·ta′tion (-jĕ-stā′shən) n.
contragestiveadjective Referring to an agent or action which prevents gestation—e.g., by preventing implantation of a fertilised egg.
noun An agent (technically an abortifacient—e.g., RU-486) which blocks progesterone receptors in the endometrium. Without progesterone, the uterus cannot sustain pregnancy, precluding successful gestation.