noun
or proc·to·de·um ˌ ̷ ̷ ̷ ̷ˈdēəm
( plural proctodaea -ēə ; or proctodae·ums -ēəmz ; or procto·dea or proctode·ums )
Etymology: New Latin, from proct- + -odaeum, -odeum (from Greek hodaios on the way, from hodos way) — more at cede
: the posterior ectodermal part of the alimentary canal formed in the embryo by invagination of the outer body wall — compare mesenteron , stomodaeum