proctodaeum

noun

proc·​to·​dae·​um ˌpräk-tə-ˈdē-əm 

plural proctodaea ˌpräk-tə-ˈdē-ə  or proctodaeums

: the embryonic posterior ectodermal part of the digestive tract

Word History

Etymology

New Latin, from Greek prōktos anus + hodos way

First Known Use

1876, in the meaning defined above