Boyd’s Bible Dictionary:
A province of Asia Minor, bordering on the Euxine (Black) sea and west of Pontus (Acts 16:7; 1 Peter 1:1). Capital, Nice or Nicaea.
Concise Bible Dictionary:
A large district in the north of Asia Minor, bordering on the Black Sea. Paul and Timotheus attempted to go into Bithynia, but the Spirit suffered them not (Acts 16:7). Peter addressed his first Epistle to those of the dispersion of Bithynia (1 Pet. 1:1). It was then a Roman province: it is now called Kastamuni, a part of Turkey in Asia.
Strong’s Dictionary of Greek Words:
Transliteration:
Bithunia
Meaning:
of uncertain derivation; Bithynia, a region of Asia
Jackson’s Dictionary of Scripture Proper Names:
violent rushing
Potts’ Bible Proper Names:
a region of Asia Minor, Acts 16:7. {Venter; internus-Belly; internal:}