Learn how to say Nummulitidae correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word nummulite:
the flat disc-shaped calcareous shell of a foraminiferan, found commonly as a fossil up to 8 cm across in marine Tertiary deposits.
Family Nummulitidae, order Foraminiferida: several genera, including Nummulites
early 19th century: from Latin nummulus (diminutive of nummus ‘coin’) + -ite1: