nummulite
/ˈnʌmjʊlaɪt/noun
1- Palaeontology the flat disc-shaped calcareous shell of a foraminiferan, found commonly as a fossil up to 8 cm across in marine Tertiary deposits【古生物】钱币虫。
1.1
- Family Nummulitidae, order Foraminiferida: several genera, including Nummulites.钱币虫科, 有孔虫目：数属, 包括钱币虫属。
词源
early 19th cent.: from Latin nummulus （diminutive of nummus 'coin'） + -ITE1.