Easton's Bible Dictionary (1897)
Head of the stream; bridle, one of Nimrod’s cities (Gen. 10:12), “between Nineveh and Calah.” It has been supposed that the four cities named in this verse were afterwards combined into one under the name of Nineveh (q.v.). Resen was on the east side of the Tigris. It is probably identified with the mound of ruins called Karamless.
Smith's Bible Dictionary (1863)
(bridle), (Genesis 10:12) one of the cities built by Asshur, “between Nineveh and Calah.” Assyrian remains of some considerable extent are found near the modern village of Selamiyeh, and it is perhaps the most probable conjecture that these represent Resen.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
RE'SEN (bridle), a noted Assyrian city between Nineveh and Calah. Gen 10:12. Rawlinson, who places Calah at Nimrud and Nineveh immediately opposite Mosul, would locate Resen between the two, near the village of Selamiyeh, about 3 miles north of Nimrud, where are Assyrian ruins. Fergusson identifies Calah with Kalah Sherghat, and Resen with Nimrud. Some have conjectured that the four cities of Gen 10:12 were all afterward combined under the one
name "Nineveh," and that "the great city" referred to this united whole. Instances of such consolidation have been numerous enough to render this theory plausible.
Hitchcock's Bible Names (1869)
a bridle or bit