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plural dinoflagellates
Any of many marine protozoa of the phylum Dinoflagellata, which have two flagella. quotations examples
Noctiluna scintillans, a tiny marine dinoflagellate, glows in the dark thanks to thousands of bioluminescent spherical organelles in its cytoplasm; gathered in millions, it can illuminate the whole sea at night.
2012, Caspar Henderson, The Book of Barely Imagined Beings, Granta Books, published 2013, page 31