Boyd’s Bible Dictionary:
(Tamar, palms). The Palmyra of the Greeks and Romans. A city built by Solomon in Syria, toward the Euphrates, for the purpose of facilitating trade with the east. Its ruins are numerous and suggestive (1 Kings 9:18; 2 Chron. 8:4). Tadmor, or Palmyra, reached the height of its splendor, wealth, and power under the celebrated Zenobia, “Queen of the East,” who made it the capital of her empire. It fell a prey to the victorious Romans. Among its notable ruins are the Temple of the Sun dedicated to Baal, a Street of Columns, of which 150 are still standing, and a series of magnificent tombs intended for both burial places and places of worship. The old name still exists in the form of Thadmor.
Concise Bible Dictionary:
Ruins of Tadmor
City built in the wilderness by Solomon (2 Chron. 8:4). Josephus (Ant. 8. 6, 1) says it was the same as that which the Greeks called PALMYRA, and that it was built so far away because there were springs there, but no water nearer in that direction. Palmyra was situated about midway between Damascus and Tiphsah or Thapsacus on the Euphrates. It is still called Tadmur, about 34° 40' N, 38° 15' E. In the time of the Romans it was a large and splendid city, of which there are columns still standing and remarkable ruins.
In 1 Kings 9:18 a city is called in the A. V. Tadmor; but the Hebrew text is TAMAR, as in the R. V. (Tadmor being the reading of the Keri). Though this was also built by Solomon in the wilderness, it is added “in the land,” whereas Tadmor was outside. The towns also mentioned in this passage are connected with the south of the land, so that it is doubtless a different place, and may be the same as Tamar in Ezekiel 47:19 and Ezekiel 48:28.
Strong’s Dictionary of Hebrew Words:
Meaning:
or Tammor (1 Kings 9:18) {tam-more'}; apparently from 8558; palm-city; Tadmor, a place near Palestine
Jackson’s Dictionary of Scripture Proper Names:
thou wilt scatter myrrh
Potts’ Bible Proper Names:
Palm―tree; palm-city:―a place near Palestine [TAMAR], 2 Chron. 8:4. {Palma}