a fossil foraminifer of the genus Camerina (Nummulites ), having a calcareous, usually disklike shell.

1805–15; nummul(ar) + -ite1

nummulitic [nuhm-yuh-lit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nummulite (ˈnʌmjʊˌlaɪt)
any of various large fossil protozoans of the family Nummulitidae, common in Tertiary times: phylum Foraminifera (foraminifers)
[C19: from New Latin Nummulites genus name, from Latin nummulus, from nummus coin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica


any of the thousands of extinct species of relatively large, lens-shaped foraminifers (single-celled marine organisms) that were abundant during the Tertiary Period (66.4 to 1.6 million years ago). Nummulites were particularly prominent during the Eocene Epoch (57.8 to 36.6 million years ago), and limestone of this age that occurs in the Sahara is called nummulite limestone in reference to the great abundance of its contained fossil nummulites.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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