abruptionEnglishOxford New American Dictionaryabruption /əˈbrəpSHən, əˈbrəpʃən / ▸ noun technical the sudden breaking away of a portion from a mass. ▪ (also placental abruption) Medicine separation of the placenta from the wall of the uterus, especially when it occurs prematurely during pregnancy. – ORIGIN early 17th century : from Latin abruptio(n)-, from abrumpere ‘break off’ (see abrupt).