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peridinium
noun
peri·din·i·um
\ˌperəˈdinēəm\
Definition of peridinium
1 capitalized : the type genus of Peridiniidae comprising marine and freshwater dinoflagellates that are typically subspherical to ovoid in outline and that sometimes have the test prolonged into short horns — compare ceratium
2 plural peridiniums \-ēəmz\ or peridinia \-ēə\ : any flagellate of the genus Peridinium
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