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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Merriam-Webster unabridged
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