Also found in: Encyclopedia, Wikipedia.
Related to coccolith: Foraminifera, Coccosphere, radiolarian
Any of several minute calcite plates that make up the external covering of certain haptophyte phytoplankton and in a fossilized state form chalk and limestone deposits.
(Geological Science) any of the round calcareous plates in chalk formations: formed the outer layer of unicellular plankton
[C19: New Latin, from Greek kokkos berry + lithos stone]
a microscopic calcareous disk or ring making up part of the covering of certain marine plankton and forming much of the content of chalk rocks.