both the Libyan capital and the Lebanese port city represent Greek tri- "three" (see tri-) + polis "city" (see polis). In Libya, Tripolis was the name of a Phoenician colony consisting of Oea (which grew into modern Tripoli), Leptis Magna, and Sabratha. Arabic distinguishes them as Tarabulus ash-sham ("Syrian Tripoli") and Tarabulus al-garb ("Western Tripoli").

Others are reading

Definitions of Tripoli from WordNet
tripoli (n.)
a weathered and decomposed siliceous limestone; in powdered form it is used in polishing;
Synonyms: rottenstone
Tripoli (n.)
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;
Synonyms: Tarabulus Al-Gharb / capital of Libya
Tripoli (n.)
a port city and commercial center in northwestern Lebanon on the Mediterranean Sea;
Synonyms: Tarabulus / Tarabulus Ash-Sham / Trablous