The Collaborative International Dictionary of English v.0.48:
Nummulite \Num"mu*lite\, n. [L. nummus a coin + -lite: cf. F. nummulite.] (Paleon.) A fossil of the genus Nummulites and allied genera. [1913 Webster]WordNet (r) 3.0 (2006):
nummulite n 1: large fossil protozoan of the Tertiary period