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The Collaborative International Dictionary
Coccosphere

Coccosphere \Coc"co*sphere\, n. [Gr. ? a grain, seed + E. sphere.] (Biol.) A small, rounded, marine organism, capable of braking up into coccoliths. [1913 Webster] ||

Wiktionary
coccosphere

n. (context biology English) A small rounded marine organism, capable of breaking up into coccoliths.