phacella
noun
pha·cel·la
fəˈselə
variants
or less commonly phacellus
-ləs
plural phacellae
-ˌlē,
-ˌlī
also phacelli
-ˌlī
: one of the rows of filaments usually bearing nematocysts on the inner surface of the gastric cavity of some scyphozoan jellyfishes
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Merriam-Webster unabridged
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