cervical os; os uteri; uterine orifice
Medical term for the opening of the cervix. Used in clinical and anatomical contexts.
The cervical os opens during childbirth.
The doctor checked the condition of the cervical os.
子宮頸部 is the 'uterine cervix' (the lower part of the uterus), whereas 子宮口 is the orifice itself.
Compound of 子宮 (shikyū, 'uterus') and 口 (kō, 'mouth, opening'). The reading こう for 口 is the on'yomi used in medical compounds.