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relaxin A mammalian hormone produced by the corpus luteum and placenta during the terminal stages of pregnancy. It relaxes the pubic symphysis and dilates the cervix of the uterus, thereby aiding parturition.

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relaxin (ri-laks-in) n. a hormone, secreted by the placenta in the terminal stages of pregnancy, that causes the cervix of the uterus to dilate and prepares the uterus for the action of oxytocin during labour.

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