Tripoli

from The American Heritage® Dictionary of the English Language, 5th Edition.

• A historical region of northern Africa roughly coextensive with the ancient region of Tripolitania. It became part of the Barbary States in the 16th century and later passed to Turkey and Italy.
• A city of northwest Lebanon on the Mediterranean Sea north-northeast of Beirut. Probably founded after the seventh century BC, it was capital of a Phoenician federation and later flourished under the Seleucid and Roman empires. Tripoli was captured by the Arabs in AD 638 and taken by the Crusaders in 1109 after a long siege.
• The capital and largest city of Libya, in the northwest part of the country on the Mediterranean Sea. Settled by Phoenicians from Tyre, it has Roman and Byzantine remains.

from The Century Dictionary.

• noun A substance consisting of decomposed impure limestone, extensively used as a polishing-powder: same as rottenstone.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) An earthy substance originally brought from Tripoli, used in polishing stones and metals. It consists almost wholly of the siliceous shells of diatoms.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun The capital city of Libya.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the capital and chief port and largest city of Libya; in northwestern Libya on the Mediterranean Sea; founded by the Phoenicians in the 7th century BC
• noun a weathered and decomposed siliceous limestone; in powdered form it is used in polishing
• noun a port city and commercial center in northwestern Lebanon on the Mediterranean Sea