A nummulite is a large lenticular fossil, characterized by its numerous coils, subdivided by septa into chambers. They are the shells of the fossil and present-day marine protozoan Nummulites, a type of foraminiferan. Nummulites commonly vary in diameter from 1.3 cm (0.5 inches) to 5 cm (2 inches) and are common in Eocene to Miocene marine rocks, ... Found on http://en.wikipedia.org/wiki/Nummulite
any of the thousands of extinct species of relatively large, lens-shaped foraminifers (single-celled marine organisms) that were abundant during the ... [2 related articles] Found on http://www.britannica.com/eb/a-z/n/63
Num'mu·lite noun [ Latin nummus a coin + -lite : confer French nummulite .] (Paleon.) A fossil of the genus Nummulites and allied genera. Found on http://www.encyclo.co.uk/webster/N/41