coccolithophore noun1 •Any of many minute mostly marine planktonic biflagellated organisms with brown chromatophores and complex calcareous, less commonly siliceous, shells.It was filled with a kind of golden-brown planktonic algae known as coccolithophores, whose skeletons would form the chalks that underlie parts of Britain, Belgium and France today. — 2018 formscoccolithophores
