numismatics

noun

Etymology: From French numismatique, from Late Latin numisma, numismatis (“coin”), variant of Latin nomisma, from Ancient Greek νόμισμα (nómisma, “current coin, custom”), from νομίζω (nomízō, “to hold or own as a custom, usage, to use customarily, practise, to be used to”), from νόμος (nómos, “usage, custom”), from νέμω (némō, “to keep, hold, watch”).

1. The study of coins, tokens, medals and paper money.
2. The study of coins.
3. The collecting of coins, tokens, medals and paper money.

   “What! Mr. Joolby, the eminent authority on Greek numismatics? To be sure we've met.”

4. The collecting of coins.