American Tract Society Bible Dictionary
The apostle, Matthew 10:3 , called in Greek Didymus, that is, a twin, John 20:24 , was probably a Galilean, as well as the other apostles; but the place of his birth, and the circumstances of his calling, are unknown, Luke 6:13-15 . He appears to have been of an impulsive character, sincerely devoted to Christ, ready to act upon his convictions, and perhaps slow to be convinced, as he at first doubted our Lord's resurrection, John 11:16; 14:5-6; 20:19-29 . Several of the fathers inform us that he preached in the Indies; and others say that he preached in Cush, or Ethiopia, near the Caspian sea.
There are nominal Christians in the East Indies, who bear the name of St. Thomas, because they report that this apostle preached the gospel there. They dwell in a peninsula of the Indus, on this side the gulf.
These files are public domain and are a derivative of the topics are from American Tract Society Bible Dictionary published in 1859.
Rand, W. W. Entry for 'Thomas'. American Tract Society Bible Dictionary. https://www.studylight.org/dictionaries/eng/ats/t/thomas.html. 1859.