1
: of, relating to, or characteristic of Bithynia in Asia Minor
2
: of, relating to, or characteristic of Bithynians
Cite this Entry
“Bithynia.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Bithynia. Accessed 22 Jun. 2026.
Copy CitationGeographical Definition
Bithynia
geographical name
Bi·thyn·ia
bə-ˈthi-nē-ə 
ancient country of northwestern Asia Minor bordering on the Sea of Marmara and the Black Sea
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