[TA] the vaginal opening of the uterus. Synonym(s): ostium uteri [TA], mouth of the womb, opening of uterus, orifice of uterus, orificium externum uteri, os uteri externum, ostium uteri externum
ex·ter·nal os of u·ter·us
(eks-tĕr'năl os yū'tĕr-ŭs) [TA] The vaginal opening of the uterus.