stomatodeum

noun
sto·​ma·​to·​de·​um
variants: or chiefly British stomatodaeum \ ˌstō-​mət-​ə-​ˈdē-​əm How to pronounce stomatodaeum (audio) \
plural stomatodea or chiefly British stomatodaea\ -​ˈdē-​ə How to pronounce stomatodaea (audio) \

Medical Definition of stomatodeum