perigonium

noun

peri·​go·​ni·​um

ˌperəˈgōnēəm

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

Word History

Etymology

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

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