proctodeum

noun
proc·​to·​de·​um
variants: or proctodaeum \ˌpräk-​tə-​ˈdē-​əm \
plural -dea or proctodaea\-​ˈdē-​ə \ or proctodeums or -daeums

Medical Definition of proctodeum 

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

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