incompetent cervix [L, in, not, competentia, capable, cervix, neck] , (in obstetrics) a condition characterized by painless dilation of the cervical os of the uterus before term without labor or contractions of the uterus. Miscarriage or premature delivery may result. Incompetent cervix is treated prophylactically by cerclage or another procedure in which the cervix is held closed by a surgically implanted suture.
