- 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.
- any of the round calcareous plates in chalk formations: formed the outer layer of unicellular plankton
More Definitions
- PRENUPTIAL (noun) Definition, Meaning & Examples
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- MONDRIAN, PIET (noun) Definition, Meaning & Examples
- MIDDLEBURG HEIGHTS (noun) Definition, Meaning & Examples
- WHITWORTH (noun) Definition, Meaning & Examples
- ELUCIDATE (noun) Definition, Meaning & Examples
