- 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.
Origin of coccolith
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- 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
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