proctodeum

noun

proc·​to·​de·​um

variants or proctodaeum

ˌpräk-tə-ˈdē-əm 

plural proctodea or proctodaea -ˈdē-ə  or proctodeums or proctodaeums

: the posterior ectodermal part of the digestive tract formed in the embryo by invagination of the outer body wall

proctodeal adjective

or proctodaeal

-ˈdē-əl