Dictionary
diges'tive sys"tem
the system by which ingested food is acted upon by physical and chemical means to provide the body with absorbable nutrients and to excrete waste products; in mammals the system includes the alimentary canal extending from the mouth to the anus, and the hormones and enzymes assisting in digestion.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.