这个词是什么意思？
A non-estrogenic contraceptive which is a weak progestin with strong anti-progesterone properties. It is effective if used once a week orally or can also be used in intravaginal devices.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D005867 · MeSH 2026。
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