new word: I'll tell you later!

[Mark Jason Dominus]

> Several people knew that the word "nummular" means "coinlike,"
> specifically referring to coin-shaped blisters or rashes on the skin.

There's a Stephen Jay Gould essay about an early-20th-century
naturalist who wrote a book about the "nummulosphere", about how the
entire earth was composed of the skeletons of nummulites, tiny
extinct coin-shaped animals.

Also, the word is realted to "numismatics", the study of coins.