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]
labourThe three stage process of delivering a baby and the PLACENTA by contractions of the muscles of the womb (uterus), of the DIAPHRAGM and of the wall of the abdomen. The first stage lasts from the onset of pains to full widening (dilatation) of the CERVIX, the second to the delivery of the baby and the third to the delivery of the placenta.
labourthe process or effort by which a baby and the placenta are expelled from the UTERUS.