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plural radiolarians
Any of many marine amoeboid protozoa, of subclass Radiolaria, having filamentous pseudopodia; they have intricate silica skeletons. quotations examples
Water wells inkblack in the streets repeating the polelamps in glozy rosettes that dish and slide in the wash like radiolarians pale with phosphorous on a midnight sea.
1979, Cormac McCarthy, Suttree, Random House, page 188