1. The posterior section of the alimentary canal in insects and other arthropods, derived from the embryonic hindgut.
Usage: zoology; entomology; technical

Examples

• The proctodeum is the final chamber of an insect's digestive system.
• In beetles, the proctodeum connects to the rectum and anus.
• The proctodeum develops from the ectodermal tissue of the embryo.
• Waste products are stored in the proctodeum before elimination.
• Entomologists study the proctodeum to understand insect physiology.