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coccolith

[kok-uh-lith] /ˈkɒk əˌlɪθ/
noun
1.
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
1865-1870
1865-70; < New Latin Coccolithus originally a genus name; see coccus, -o-, -lith
Related forms
coccolithic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for coccolith

coccolith

/ˈkɒkəlɪθ/
noun
1.
any of the round calcareous plates in chalk formations: formed the outer layer of unicellular plankton
Word Origin
C19: New Latin, from Greek kokkos berry + lithos stone
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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