labour(redirected from labor under)
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la·bor, stages of labor (lā'bŏr, stājĕz)
The process of expulsion of the fetus and the placenta from the uterus. The stages of labor are: first stage, beginning with the onset of uterine contractions through the period of dilation of the os uteri; second stage, the period of expulsive effort, beginning with complete dilation of the cervix and ending with expulsion of the infant; third stage, or placental stage, the period beginning at the expulsion of the infant and ending with the completed expulsion of the placenta and membranes.
[L. toil, suffering]