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plural nulliparas or nulliparae
A woman who has never carried a pregnancy beyond 20 weeks (one who has never given birth). It includes women who have experienced spontaneous miscarriages and induced abortions before the mid-point of pregnancy, but not women who have experienced pregnancy loss after 20 weeks. quotations examples
The active phase of labour lasts on average 8 hours for the nullipara and 6 hours for the multipara.
2005, Martha Finn, Women's Health: A Core Curriculum, page 147