noun
or sto·mo·de·um ˌ ̷ ̷ ̷ ̷ˈdēəm
( plural stomo·daea -ēə ; also stomodaeums -ēəmz ; or stomo·dea -ēə ; also stomodeums )
Etymology: New Latin, from stom- + -odaeum, -doeum (from Greek hodaion, neuter of hodaios being on the way, from hodos way) — more at cede
: the anterior ectodermal part of the alimentary canal or tract including all formed by invagination of the external body wall — compare proctodaeum ; see ctenophore illustration