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Medical Term:


Pronunciation: la'bor

Definition: The process of expulsion of the fetus and the placenta from the uterus. The stages of labor include: 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]

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.