1) Break 2) Breaking off 3) Disruption 4) Interruption 5) Premature detachment 
• (n.) A sudden breaking off; a violent separation of bodies.
A tearing away, separation, or detachment. ... (05 Mar 2000) ... 
When the placenta
Premature detachment.
Ab·rup'tion noun [ Latin abruptio , from abrumpere : confer French abruption .] A sudden breaking off; a violent separation of bodies. Woodward. 
Type: Term Pronunciation: ab-rŭp′shŭn Definitions: 1. A tearing away, separation, or detachment.
Abruption: A sudden breaking off or away. Abruption of the placenta (abruptio placentae) is the premature separation of the placenta from the wall of the uterus, a potentially very serious situation for the mother and baby.
A detachment or tearing away. In obstetrics, it is most commonly referred to as placental abruption. Narrower term(s): Placental Abruption
abruption An instance of suddenly breaking away or off.
a sudden breaking off.
When the placenta begins to separate from the wall of the uterus before the baby is born. Symptoms of an abruption usually include bleeding and abdominal pain.