from The American Heritage® Dictionary of the English Language, 4th Edition
- suffix A system of laws governing or a body of knowledge about a specified field: aeronomy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- suffix a system of rules, laws, or knowledge about a body of a particular field; distribution, arrangement, management
Greek -nomiā, from nomos, law; see nem- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek νόμος (nomos, "law, custom"). (Wiktionary)