(n.) The posterior opening of the alimentary canal, through which the excrements are expelled.

abdomen appendix asshole blind gut bowels brain bung bunghole cecum colon duodenum endocardium entrails foregut giblets gizzard guts heart hindgut innards inner mechanism insides internals intestine inwards jejunum kidney kishkes large intestine liver liver and lights lung midgut perineum pump pylorus rectum small intestine spleen stomach ticker tripes vermiform appendix viscera vitals works