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perigonium

noun
peri·​go·​ni·​um | \ ˌperəˈgōnēəm\
plural perigonia\ -​ēə \

Definition of perigonium

1 : a perianth especially of a liverwort — compare perichaetium
2 : a sac surrounding the generative bodies in the gonophore of a hydroid

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History and Etymology for perigonium

New Latin, from peri- + gon- + -ium

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