coccolithic

coccolith

[kok-uh-lith]
noun
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:
1865–70; < Neo-Latin Coccolithus originally a genus name; see coccus, -o-, -lith

coccolithic, adjective
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World English Dictionary
coccolith (ˈkɒkəlɪθ)
 
n
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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