Search Result for "megacolon": 
Wordnet 3.0

NOUN (1)

1. an abnormal enlargement of the colon; can be congenital (as in Hirschsprung's disease) or acquired (as when children refuse to defecate); 



WordNet (r) 3.0 (2006):

megacolon
    n 1: an abnormal enlargement of the colon; can be congenital (as
         in Hirschsprung's disease) or acquired (as when children
         refuse to defecate)