Congenital megacolon

What is Congenital megacolon?

Congenital megacolon definition and meaning on Dictionary terms:
verb (used with object)
to fill to excess; overcrowd or overburden; clog: The subway entrance was so congested that no one could move.
Pathology. to cause an unnatural accumulation of blood or other fluid in (a body part or blood vessel): The cold congested her sinuses.
Obsolete. to heap together.

verb (used without object)
to become congested: His throat congested with phlegm.