from The American Heritage® Dictionary of the English Language, 4th Edition
- An ancient country of northwest Asia Minor in present-day Turkey. Originally inhabited by Thracians, it was absorbed into the Roman Empire by the end of the first century B.C.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- proper n. An ancient region, kingdom and Roman province in the northwest of Asia Minor
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an ancient country in northwestern Asia Minor in what is now Turkey; was absorbed into the Roman Empire by the end of the 1st century BC
From Latin Bithynia, from Ancient Greek Βιθυνία (Bithunia). (Wiktionary)