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perigonium

noun peri·go·ni·um \ ˌperəˈgōnēəm \
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Definition of perigonium

plural perigonia \-ēə\
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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Origin and Etymology of perigonium

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

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