The Collaborative International Dictionary of English v.0.48:
Distension \Dis*ten"sion\, n. Same as Distention. [1913 Webster]WordNet (r) 3.0 (2006):
distension n 1: the act of expanding by pressure from within [syn: distention, distension] 2: the state of being stretched beyond normal dimensions [syn: dilatation, distension, distention]