Wordnet 3.0
NOUN (1)
1. 
 the slipping or falling out of place of an organ (as the uterus); 
[syn: prolapse, prolapsus, descensus]
WordNet (r) 3.0 (2006):
descensus
    n 1: the slipping or falling out of place of an organ (as the
         uterus) [syn: prolapse, prolapsus, descensus]